bpo-45439: Rename _PyObject_CallNoArg() to _PyObject_CallNoArgs() (GH-28891)

Fix typo in the private _PyObject_CallNoArg() function name: rename
it to _PyObject_CallNoArgs() to be consistent with the public
function PyObject_CallNoArgs().

Python/errors.c

@@ -91,7 +91,7 @@ _PyErr_CreateException(PyObject *exception_type, PyObject *value)
     PyObject *exc;
 
     if (value == NULL || value == Py_None) {
-        exc = _PyObject_CallNoArg(exception_type);
+        exc = _PyObject_CallNoArgs(exception_type);
     }
     else if (PyTuple_Check(value)) {
         exc = PyObject_Call(exception_type, value, NULL);