Use _PyObject_CallNoArg()

Replace:
    PyObject_CallFunctionObjArgs(callable, NULL)
with:
    _PyObject_CallNoArg(callable)

Modules/_asynciomodule.c

@@ -1948,7 +1948,7 @@ task_step_impl(TaskObj *task, PyObject *exc)
 
         if (!exc) {
             /* exc was not a CancelledError */
-            exc = PyObject_CallFunctionObjArgs(asyncio_CancelledError, NULL);
+            exc = _PyObject_CallNoArg(asyncio_CancelledError);
             if (!exc) {
                 goto fail;
             }

Modules/_ctypes/_ctypes.c

@@ -5258,7 +5258,7 @@ cast(void *ptr, PyObject *src, PyObject *ctype)
     CDataObject *result;
     if (0 == cast_check_pointertype(ctype))
         return NULL;
-    result = (CDataObject *)PyObject_CallFunctionObjArgs(ctype, NULL);
+    result = (CDataObject *)_PyObject_CallNoArg(ctype);
     if (result == NULL)
         return NULL;
 

Modules/_ctypes/callbacks.c

@@ -181,7 +181,7 @@ static void _CallPythonObject(void *mem,
             */
         } else if (dict) {
             /* Hm, shouldn't we use PyCData_AtAddress() or something like that instead? */
-            CDataObject *obj = (CDataObject *)PyObject_CallFunctionObjArgs(cnv, NULL);
+            CDataObject *obj = (CDataObject *)_PyObject_CallNoArg(cnv);
             if (!obj) {
                 PrintError("create argument %d:\n", i);
                 Py_DECREF(cnv);

Modules/_ssl.c

@@ -3197,7 +3197,7 @@ _password_callback(char *buf, int size, int rwflag, void *userdata)
     PySSL_END_ALLOW_THREADS_S(pw_info->thread_state);
 
     if (pw_info->callable) {
-        fn_ret = PyObject_CallFunctionObjArgs(pw_info->callable, NULL);
+        fn_ret = _PyObject_CallNoArg(pw_info->callable);
         if (!fn_ret) {
             /* TODO: It would be nice to move _ctypes_add_traceback() into the
                core python API, so we could use it to add a frame here */

Modules/mathmodule.c

@@ -951,7 +951,7 @@ static PyObject * math_ceil(PyObject *self, PyObject *number) {
             return NULL;
         return math_1_to_int(number, ceil, 0);
     }
-    result = PyObject_CallFunctionObjArgs(method, NULL);
+    result = _PyObject_CallNoArg(method);
     Py_DECREF(method);
     return result;
 }
@@ -991,7 +991,7 @@ static PyObject * math_floor(PyObject *self, PyObject *number) {
             return NULL;
         return math_1_to_int(number, floor, 0);
     }
-    result = PyObject_CallFunctionObjArgs(method, NULL);
+    result = _PyObject_CallNoArg(method);
     Py_DECREF(method);
     return result;
 }
@@ -1542,7 +1542,7 @@ math_trunc(PyObject *self, PyObject *number)
                          Py_TYPE(number)->tp_name);
         return NULL;
     }
-    result = PyObject_CallFunctionObjArgs(trunc, NULL);
+    result = _PyObject_CallNoArg(trunc);
     Py_DECREF(trunc);
     return result;
 }

Modules/posixmodule.c

@@ -902,7 +902,7 @@ path_converter(PyObject *o, void *p)
             goto error_exit;
         }
 
-        o = to_cleanup = PyObject_CallFunctionObjArgs(func, NULL);
+        o = to_cleanup = _PyObject_CallNoArg(func);
         Py_DECREF(func);
         if (NULL == o) {
             goto error_exit;
@@ -12046,7 +12046,7 @@ PyOS_FSPath(PyObject *path)
                             Py_TYPE(path)->tp_name);
     }
 
-    path_repr = PyObject_CallFunctionObjArgs(func, NULL);
+    path_repr = _PyObject_CallNoArg(func);
     Py_DECREF(func);
     if (NULL == path_repr) {
         return NULL;

Objects/abstract.c

@@ -103,7 +103,7 @@ PyObject_LengthHint(PyObject *o, Py_ssize_t defaultvalue)
         }
         return defaultvalue;
     }
-    result = PyObject_CallFunctionObjArgs(hint, NULL);
+    result = _PyObject_CallNoArg(hint);
     Py_DECREF(hint);
     if (result == NULL) {
         if (PyErr_ExceptionMatches(PyExc_TypeError)) {

Objects/bytesobject.c

@@ -549,7 +549,7 @@ format_obj(PyObject *v, const char **pbuf, Py_ssize_t *plen)
     /* does it support __bytes__? */
     func = _PyObject_LookupSpecial(v, &PyId___bytes__);
     if (func != NULL) {
-        result = PyObject_CallFunctionObjArgs(func, NULL);
+        result = _PyObject_CallNoArg(func);
         Py_DECREF(func);
         if (result == NULL)
             return NULL;
@@ -2569,7 +2569,7 @@ bytes_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
        PyObject_Bytes doesn't do. */
     func = _PyObject_LookupSpecial(x, &PyId___bytes__);
     if (func != NULL) {
-        new = PyObject_CallFunctionObjArgs(func, NULL);
+        new = _PyObject_CallNoArg(func);
         Py_DECREF(func);
         if (new == NULL)
             return NULL;

Objects/complexobject.c

@@ -273,7 +273,7 @@ try_complex_special_method(PyObject *op) {
 
     f = _PyObject_LookupSpecial(op, &PyId___complex__);
     if (f) {
-        PyObject *res = PyObject_CallFunctionObjArgs(f, NULL);
+        PyObject *res = _PyObject_CallNoArg(f);
         Py_DECREF(f);
         if (res != NULL && !PyComplex_Check(res)) {
             PyErr_SetString(PyExc_TypeError,

Objects/enumobject.c

@@ -258,7 +258,7 @@ reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
         return NULL;
     }
     if (reversed_meth != NULL) {
-        PyObject *res = PyObject_CallFunctionObjArgs(reversed_meth, NULL);
+        PyObject *res = _PyObject_CallNoArg(reversed_meth);
         Py_DECREF(reversed_meth);
         return res;
     }

Objects/object.c

@@ -596,7 +596,7 @@ PyObject_Bytes(PyObject *v)
 
     func = _PyObject_LookupSpecial(v, &PyId___bytes__);
     if (func != NULL) {
-        result = PyObject_CallFunctionObjArgs(func, NULL);
+        result = _PyObject_CallNoArg(func);
         Py_DECREF(func);
         if (result == NULL)
             return NULL;
@@ -1314,7 +1314,7 @@ _dir_object(PyObject *obj)
         return NULL;
     }
     /* use __dir__ */
-    result = PyObject_CallFunctionObjArgs(dirfunc, NULL);
+    result = _PyObject_CallNoArg(dirfunc);
     Py_DECREF(dirfunc);
     if (result == NULL)
         return NULL;

Objects/odictobject.c

@@ -1256,7 +1256,7 @@ odict_copy(register PyODictObject *od)
     if (PyODict_CheckExact(od))
         od_copy = PyODict_New();
     else
-        od_copy = PyObject_CallFunctionObjArgs((PyObject *)Py_TYPE(od), NULL);
+        od_copy = _PyObject_CallNoArg((PyObject *)Py_TYPE(od));
     if (od_copy == NULL)
         return NULL;
 

Python/bltinmodule.c

@@ -2074,7 +2074,7 @@ builtin_round(PyObject *self, PyObject *args, PyObject *kwds)
     }
 
     if (ndigits == NULL || ndigits == Py_None)
-        result = PyObject_CallFunctionObjArgs(round, NULL);
+        result = _PyObject_CallNoArg(round);
     else
         result = PyObject_CallFunctionObjArgs(round, ndigits, NULL);
     Py_DECREF(round);

Python/ceval.c

@@ -3062,7 +3062,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
             Py_DECREF(mgr);
             if (enter == NULL)
                 goto error;
-            res = PyObject_CallFunctionObjArgs(enter, NULL);
+            res = _PyObject_CallNoArg(enter);
             Py_DECREF(enter);
             if (res == NULL)
                 goto error;
@@ -3096,7 +3096,7 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
             }
             SET_TOP(exit);
             Py_DECREF(mgr);
-            res = PyObject_CallFunctionObjArgs(enter, NULL);
+            res = _PyObject_CallNoArg(enter);
             Py_DECREF(enter);
             if (res == NULL)
                 goto error;

Python/sysmodule.c

@@ -1098,7 +1098,7 @@ _PySys_GetSizeOf(PyObject *o)
                          Py_TYPE(o)->tp_name);
     }
     else {
-        res = PyObject_CallFunctionObjArgs(method, NULL);
+        res = _PyObject_CallNoArg(method);
         Py_DECREF(method);
     }