Fixes: memleak
Fixes: 
398401912/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-4669849976766464

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

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 1ae09efc150..81a0ae31bab 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -1122,6 +1122,10 @@ static int read_gab2_sub(AVFormatContext *s, AVStream 
*st, AVPacket *pkt)
         int size;
         AVProbeData pd;
         unsigned int desc_len;
+
+        if (ast->sub_ctx)
+            return 0;
+
         AVIOContext *pb = avio_alloc_context(pkt->data + 7,
                                              pkt->size - 7,
                                              0, NULL, NULL, NULL, NULL);
-- 
2.49.0

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