Make sure we have an rtsp session

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25518 b3059339-0415-0410-9bf9-f77b7e298cf2

libmpdemux/demux_nemesi.c

@@ -190,6 +190,9 @@ static demuxer_t* demux_open_rtp(demuxer_t* demuxer)
         return demuxer;
     }
 
+    if (!ctl->rtsp_queue)
+        return demuxer;
+
     media = ctl->rtsp_queue->media_queue;
     for (; media; media=media->next) {
         sdp_medium_info * info = media->medium_info;