handler can be NULL if we did not support this dynamic format (codec).

Fixes issue 1658 (the crasher), although the format itself is obviously 
still unsupported.



git-svn-id: file:///var/local/repositories/ffmpeg/trunk@21078 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/rdt.c

@@ -67,7 +67,7 @@ ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx,
     s->prev_set_id    = -1;
     s->prev_stream_id = -1;
     s->prev_timestamp = -1;
-    s->parse_packet = handler->parse_packet;
+    s->parse_packet = handler ? handler->parse_packet : NULL;
     s->dynamic_protocol_context = priv_data;
 
     return s;