avi: directly resync on DV in AVI read failure

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

libavformat/avidec.c

@@ -1061,6 +1061,8 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
         int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
         if (size >= 0)
             return size;
+        else
+            goto resync;
     }
 
     if (avi->non_interleaved) {