Fixes: memleak
Fixes: 
15297/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5746203548975104

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

diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c
index 2b88c899d0..89120aa8fb 100644
--- a/libavcodec/4xm.c
+++ b/libavcodec/4xm.c
@@ -697,6 +697,7 @@ static const uint8_t *read_huffman_tables(FourXContext *f,
         len_tab[j]  = len;
     }
 
+    ff_free_vlc(&f->pre_vlc);
     if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257, len_tab, 1, 1,
                  bits_tab, 4, 4, 0))
         return NULL;
-- 
2.22.0

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