From 721af294d9b7ba5df9ffe52b83254654c3d55f16 Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Sun, 29 Apr 2012 17:39:31 -0700
Subject: [PATCH] mkv: forward EMBL block data error

Do not return 0 on error.
---
 libavformat/matroskadec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index e45cfb02c9..5688658055 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;