Fixes: infinite loop
Fixes: 
401658595/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5756875014733824
Regression since: 61fa1e14e4178d3f2550c76f7a36484220f6dc0c

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/imf_cpl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavformat/imf_cpl.c b/libavformat/imf_cpl.c
index 137cff2a63c..6ddea62abef 100644
--- a/libavformat/imf_cpl.c
+++ b/libavformat/imf_cpl.c
@@ -709,8 +709,7 @@ static int fill_virtual_tracks(void *log_ctx, xmlNodePtr 
cpl_element, FFIMFCPL *
         av_log(log_ctx, AV_LOG_DEBUG, "Processing IMF CPL Segment\n");
 
         sequence_list_elem = 
ff_imf_xml_get_child_element_by_name(segment_elem, "SequenceList");
-        if (!sequence_list_elem)
-            continue;
+        if (sequence_list_elem) {
 
         sequence_elem = xmlFirstElementChild(sequence_list_elem);
         while (sequence_elem) {
@@ -735,6 +734,7 @@ static int fill_virtual_tracks(void *log_ctx, xmlNodePtr 
cpl_element, FFIMFCPL *
 
             sequence_elem = xmlNextElementSibling(sequence_elem);
         }
+        }
 
         segment_elem = xmlNextElementSibling(segment_elem);
     }
-- 
2.49.0

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