Remove unused func parameter of _PyStack_UnpackDict()

Issue #29259.

Include/abstract.h

@@ -193,8 +193,7 @@ PyAPI_FUNC(int) _PyStack_UnpackDict(
     Py_ssize_t nargs,
     PyObject *kwargs,
     PyObject ***p_stack,
-    PyObject **p_kwnames,
-    PyObject *func);
+    PyObject **p_kwnames);
 
 /* Suggested size (number of positional arguments) for arrays of PyObject*
    allocated on a C stack to avoid allocating memory on the heap memory. Such

Objects/abstract.c

@@ -2423,7 +2423,7 @@ _PyStack_AsDict(PyObject **values, PyObject *kwnames)
 
 int
 _PyStack_UnpackDict(PyObject **args, Py_ssize_t nargs, PyObject *kwargs,
-                    PyObject ***p_stack, PyObject **p_kwnames, PyObject *func)
+                    PyObject ***p_stack, PyObject **p_kwnames)
 {
     PyObject **stack, **kwstack;
     Py_ssize_t nkwargs;

Objects/methodobject.c

@@ -240,8 +240,7 @@ _PyCFunction_FastCallDict(PyObject *func_obj, PyObject **args, Py_ssize_t nargs,
         PyObject *kwnames;
         _PyCFunctionFast fastmeth = (_PyCFunctionFast)meth;
 
-        if (_PyStack_UnpackDict(args, nargs, kwargs,
-                                &stack, &kwnames, func_obj) < 0) {
+        if (_PyStack_UnpackDict(args, nargs, kwargs, &stack, &kwnames) < 0) {
             return NULL;
         }