avoid using a pointer to freed memory on syslog.syslog

Author: noamcohen97

Modules/syslogmodule.c

@@ -192,8 +192,9 @@ syslog_syslog(PyObject * self, PyObject * args)
         if ((openargs = PyTuple_New(0))) {
             PyObject *openlog_ret = syslog_openlog(self, openargs, NULL);
             Py_DECREF(openargs);
-            Py_XDECREF(openlog_ret);
-            if (openlog_ret == NULL) {
+            if (openlog_ret != NULL) {
+                Py_DECREF(openlog_ret);
+            } else {
                 return NULL;
             }
         } else {