Fix music on hold to quitat hangup rather than during channel destruction (bug #3035)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4691 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_musiconhold.c

@@ -513,6 +513,7 @@ static int moh0_exec(struct ast_channel *chan, void *data)
 		return -1;
 	}
 	while(!ast_safe_sleep(chan, 10000));
+	ast_moh_stop(chan);
 	return -1;
 }