Do not return 0 on error.
---
 libavformat/matroskadec.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index e45cfb0..5688658 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1717,7 +1717,7 @@ static int matroska_parse_block(MatroskaDemuxContext 
*matroska, uint8_t *data,
 
     if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
         av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
-        return res;
+        return n;
     }
     data += n;
     size -= n;
-- 
1.7.8.rc1

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