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().

Modules/_functoolsmodule.c

@@ -1440,7 +1440,7 @@ static int
 _functools_exec(PyObject *module)
 {
     _functools_state *state = get_functools_state(module);
-    state->kwd_mark = _PyObject_CallNoArg((PyObject *)&PyBaseObject_Type);
+    state->kwd_mark = _PyObject_CallNoArgs((PyObject *)&PyBaseObject_Type);
     if (state->kwd_mark == NULL) {
         return -1;
     }