avcodec/midivid: Perform lzss_uncompress() before ff_reget_buffer()

This would avoid regeting the frame on lzss errors

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/midivid.c

@@ -198,12 +198,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
     bytestream2_skip(gb, 8);
     uncompressed = bytestream2_get_le32(gb);
 
-    if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
-        return ret;
-
-    if (uncompressed) {
-        ret = decode_mvdv(s, avctx, frame);
-    } else {
+    if (!uncompressed) {
         av_fast_padded_malloc(&s->uncompressed, &s->uncompressed_size, 16LL * (avpkt->size - 12));
         if (!s->uncompressed)
             return AVERROR(ENOMEM);
@@ -212,9 +207,13 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
         if (ret < 0)
             return ret;
         bytestream2_init(gb, s->uncompressed, ret);
-        ret = decode_mvdv(s, avctx, frame);
     }
 
+    if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
+        return ret;
+
+    ret = decode_mvdv(s, avctx, frame);
+
     if (ret < 0)
         return ret;
     key = ret;