gh-83004: Clean up refleak in _zoneinfo initialisation (#98842)

Author: hauntsaninja

Misc/NEWS.d/next/Library/2022-11-02-05-54-02.gh-issue-83004.0v8iyw.rst

@@ -0,0 +1 @@
+Clean up refleak on failed module initialisation in :mod:`_zoneinfo`

Modules/_zoneinfo.c

@@ -2657,8 +2657,9 @@ zoneinfomodule_exec(PyObject *m)
         goto error;
     }
 
-    Py_INCREF(&PyZoneInfo_ZoneInfoType);
-    PyModule_AddObject(m, "ZoneInfo", (PyObject *)&PyZoneInfo_ZoneInfoType);
+    if (PyModule_AddObjectRef(m, "ZoneInfo", (PyObject *)&PyZoneInfo_ZoneInfoType) < 0) {
+        goto error;
+    }
 
     /* Populate imports */
     _tzpath_find_tzfile =