Fixes: leak
Fixes: 
62164/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-6167847715602432

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/jpegxl_parser.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/jpegxl_parser.c b/libavcodec/jpegxl_parser.c
index 6656ed35c51..17e87d5cc34 100644
--- a/libavcodec/jpegxl_parser.c
+++ b/libavcodec/jpegxl_parser.c
@@ -777,8 +777,10 @@ static int read_vlc_prefix(GetBitContext *gb, 
JXLEntropyDecoder *dec, JXLSymbolD
         }
     }
 
-    if (total_code != 32768 && level2_codecounts[0] < dist->alphabet_size - 1)
-        return AVERROR_INVALIDDATA;
+    if (total_code != 32768 && level2_codecounts[0] < dist->alphabet_size - 1) 
{
+        ret = AVERROR_INVALIDDATA;
+        goto end;
+    }
 
     for (int i = 1; i < dist->alphabet_size + 1; i++)
         level2_codecounts[i] += level2_codecounts[i - 1];
-- 
2.17.1

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