bpo-37483: add _PyObject_CallOneArg() function (#14558)

diff --git a/Objects/longobject.c b/Objects/longobject.c
index 50ea2a4..3978f5c 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -5611,8 +5611,7 @@
     Py_DECREF(bytes);
 
     if (long_obj != NULL && type != &PyLong_Type) {
-        Py_SETREF(long_obj, PyObject_CallFunctionObjArgs((PyObject *)type,
-                                                         long_obj, NULL));
+        Py_SETREF(long_obj, _PyObject_CallOneArg((PyObject *)type, long_obj));
     }
 
     return long_obj;