[3.13] gh-129345: null check for indent syslogmodule (GH-129348) (#129442)

gh-129345: null check for indent syslogmodule (GH-129348)
(cherry picked from commit 25cf79a082)

Co-authored-by: Burkov Egor <xwooffie@gmail.com>

Modules/syslogmodule.c

@@ -176,7 +176,7 @@ syslog_openlog_impl(PyObject *module, PyObject *ident, long logopt,
         }
     }
     if (PySys_Audit("syslog.openlog", "Oll", ident ? ident : Py_None, logopt, facility) < 0) {
-        Py_DECREF(ident);
+        Py_XDECREF(ident);
         return NULL;
     }