Fixes: Timeout
Fixes: 
21104/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5129580475318272

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/cbs_jpeg.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavcodec/cbs_jpeg.c b/libavcodec/cbs_jpeg.c
index 89512a26bb..a0217fdeca 100644
--- a/libavcodec/cbs_jpeg.c
+++ b/libavcodec/cbs_jpeg.c
@@ -148,15 +148,14 @@ static int cbs_jpeg_split_fragment(CodedBitstreamContext 
*ctx,
         if (marker == JPEG_MARKER_EOI) {
             break;
         } else if (marker == JPEG_MARKER_SOS) {
+            next_marker = -1;
             for (i = start; i + 1 < frag->data_size; i++) {
                 if (frag->data[i] != 0xff)
                     continue;
                 end = i;
                 for (++i; i + 1 < frag->data_size &&
                           frag->data[i] == 0xff; i++);
-                if (i + 1 >= frag->data_size) {
-                    next_marker = -1;
-                } else {
+                if (i + 1 < frag->data_size) {
                     if (frag->data[i] == 0x00)
                         continue;
                     next_marker = frag->data[i];
-- 
2.17.1

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