Fixes: Timeout
Fixes: 
49504/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-570457772222054

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 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c
index 8941d715fa..a7c9043b0a 100644
--- a/libavcodec/4xm.c
+++ b/libavcodec/4xm.c
@@ -950,9 +950,11 @@ static int decode_frame(AVCodecContext *avctx, AVFrame 
*picture,
     } else if (frame_4cc == AV_RL32("snd_")) {
         av_log(avctx, AV_LOG_ERROR, "ignoring snd_ chunk length:%d\n",
                buf_size);
+        return AVERROR_INVALIDDATA;
     } else {
         av_log(avctx, AV_LOG_ERROR, "ignoring unknown chunk length:%d\n",
                buf_size);
+        return AVERROR_INVALIDDATA;
     }
 
     picture->key_frame = picture->pict_type == AV_PICTURE_TYPE_I;
-- 
2.17.1

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