check return value stop seg. Bug #967

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2328 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/h323/ast_h323.cpp

@@ -673,6 +673,10 @@ H323Channel * MyH323Connection::CreateRealTimeLogicalChannel(const H323Capabilit
 	/* Determine the Local (A side) IP Address and port */
 	info = on_create_connection(GetCallReference()); 
 
+	if (!info) {
+		return NULL;
+	}
+
         GetControlChannel().GetLocalAddress().GetIpAndPort(externalIpAddress, port);
 	externalPort = info->port;