rtsp: Fix a crash with the RTSP muxer

This was introduced in bc2a32969e.

The whole block that the statement was added to is only
relevant when used as a demuxer, but the other statements
there have had other if statements guarding them. Make
sure to only run this whole block if being used as a
demuxer.

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/rtsp.c

@@ -827,7 +827,8 @@ int ff_rtsp_open_transport_ctx(AVFormatContext *s, RTSPStream *rtsp_st)
 
     if (!rtsp_st->transport_priv) {
          return AVERROR(ENOMEM);
-    } else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RTP) {
+    } else if (CONFIG_RTPDEC && rt->transport == RTSP_TRANSPORT_RTP &&
+               s->iformat) {
         RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
         rtpctx->ssrc = rtsp_st->ssrc;
         if (rtsp_st->dynamic_handler) {