Remove useless assert(), since this can (in theora) be used for any Xiph

codec, so there's no reason to (invalidly) limit it to only Theora.

Also fixes issue 1880 (compilation error on -DDEBUG).

Originally committed as revision 22886 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/rtpdec_xiph.c

@@ -351,7 +351,6 @@ static int xiph_parse_sdp_line(AVFormatContext *s, int st_index,
     int value_size = strlen(line), attr_size = sizeof(attr), res = 0;
     AVCodecContext* codec = s->streams[st_index]->codec;
 
-    assert(codec->id == CODEC_ID_THEORA);
     assert(data);
 
     if (!(value = av_malloc(value_size))) {