sync with 1.2

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2-netsec@93679 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -2631,7 +2631,7 @@ static struct iax2_peer *realtime_peer(const char *peername, struct sockaddr_in
 		var = ast_load_realtime("iaxpeers", "name", peername, "host", "dynamic", NULL);
 		if (!var)
 			var = ast_load_realtime("iaxpeers", "name", peername, "host", ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr));
-	} else {
+	} else if (sin) {
 		char porta[25];
 		ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr);
 		sprintf(porta, "%d", ntohs(sin->sin_port));