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().

Objects/fileobject.c

@@ -190,7 +190,7 @@ PyObject_AsFileDescriptor(PyObject *o)
         return -1;
     }
     else if (meth != NULL) {
-        PyObject *fno = _PyObject_CallNoArg(meth);
+        PyObject *fno = _PyObject_CallNoArgs(meth);
         Py_DECREF(meth);
         if (fno == NULL)
             return -1;