Don't bother reloading chan_h323 if it did not load successfully in the first place. This would otherwise cause a crash.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@75619 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_h323.c

@@ -2999,6 +2999,10 @@ static int h323_do_reload(void)
 
 static int reload(void)
 {
+	if (!sched || !io) {
+		ast_log(LOG_NOTICE, "Unload and load chan_h323.so again in order to receive configuration changes.\n");
+		return 0;
+	}
 	return h323_reload(0, 0, NULL);
 }