[bink] Check return value of avio_seek and avoid modifying state if it fails

libavformat/bink.c

@@ -256,7 +256,9 @@ static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, in
         return -1;
 
     /* seek to the first frame */
-    avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET);
+    if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0)
+        return -1;
+
     bink->video_pts = 0;
     memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
     bink->current_track = -1;