Finally enable B-frame decoding as all known samples work perfect

Originally committed as revision 6309 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vc1.c

@@ -4201,12 +4201,6 @@ static int vc1_decode_frame(AVCodecContext *avctx,
         return -1;
     }
 
-    /* skip B frames as they are not decoded correctly */
-    if(s->pict_type == B_TYPE){
-        av_free(buf2);
-        return buf_size;
-    }
-
     // for hurry_up==5
     s->current_picture.pict_type= s->pict_type;
     s->current_picture.key_frame= s->pict_type == I_TYPE;