bpo-44854: Remove trailing whitespaces (GH-27689)

Objects/genericaliasobject.c

@@ -576,7 +576,7 @@ static PyGetSetDef ga_properties[] = {
 };
 
 /* A helper function to create GenericAlias' args tuple and set its attributes.
- * Returns 1 on success, 0 on failure. 
+ * Returns 1 on success, 0 on failure.
  */
 static inline int
 setup_ga(gaobject *alias, PyObject *origin, PyObject *args) {