Fixes: Timeout (16sec -> 5sec)
Fixes: 
14128/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ARBC_fuzzer-5767365721063424

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

diff --git a/libavcodec/arbc.c b/libavcodec/arbc.c
index a8b0bb0d8b..08d3a0ae6b 100644
--- a/libavcodec/arbc.c
+++ b/libavcodec/arbc.c
@@ -121,7 +121,7 @@ static int decode_frame(AVCodecContext *avctx, void *data,
     bytestream2_skip(&s->gb, 8);
     nb_segments = bytestream2_get_le16(&s->gb);
     if (nb_segments == 0)
-        keyframe = 0;
+        return avpkt->size;
 
     if (7 * nb_segments > bytestream2_get_bytes_left(&s->gb))
         return AVERROR_INVALIDDATA;
-- 
2.21.0

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