* mu-log.c: cosmetics

src/mu-log.c

@@ -231,6 +231,8 @@ log_write (const char* domain, GLogLevelFlags level,
 	/* log lines will be truncated at 255 chars */
 	char buf [512], timebuf [32];
 
+	g_return_if_fail (MU_LOG);
+
 	/* get the time/date string */
 	now = time(NULL);
 	strftime (timebuf, sizeof(timebuf), "%F %T", localtime(&now));