h264: remove reschange blocking

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264.c

@@ -2743,11 +2743,6 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
                      || h->cur_chroma_format_idc != h->sps.chroma_format_idc
                      || av_cmp_q(h->sps.sar, s->avctx->sample_aspect_ratio)));
 
-    if(must_reinit && (h != h0 || (s->avctx->active_thread_type & FF_THREAD_FRAME))) {
-        av_log_missing_feature(s->avctx,
-                                "Width/height/bit depth/chroma idc changing with threads", 0);
-        return AVERROR_PATCHWELCOME;   // width / height changed during parallelized decoding
-    }
 
     s->mb_width  = h->sps.mb_width;
     s->mb_height = h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);