err_input(): Nailed a small memory leak. If the error is E_INTR, the

v temporary variable was never decref'd.  Test this by starting up the
interpreter, hitting C-c, then immediately exiting.

Same potential leak can occur if error is E_NOMEM, since the return is
done in the case block.  Added Py_XDECREF(v); to both blocks, just
before the return.

Python/pythonrun.c

@@ -992,13 +992,14 @@ err_input(err)
 		break;
 	case E_TOKEN:
 		msg = "invalid token";
-
 		break;
 	case E_INTR:
 		PyErr_SetNone(PyExc_KeyboardInterrupt);
+		Py_XDECREF(v);
 		return;
 	case E_NOMEM:
 		PyErr_NoMemory();
+		Py_XDECREF(v);
 		return;
 	case E_EOF:
 		msg = "unexpected EOF while parsing";