Fixes: Timeout (26sec -> 18sec)
Fixes: 
13448/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-576903098243481

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/jpeg2000dec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index a4291bc06b..7749c980e5 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1730,6 +1730,8 @@ static inline void tile_codeblocks(Jpeg2000DecoderContext 
*s, Jpeg2000Tile *tile
                                     bandpos);
                         if (ret)
                             coded = 1;
+                        else
+                            continue;
                         x = cblk->coord[0][0] - band->coord[0][0];
                         y = cblk->coord[1][0] - band->coord[1][0];
 
-- 
2.21.0

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