avformat/mov: Do not use reference stream in mov_read_sidx() if there is no reference stream
Fixes: NULL pointer dereference Fixes: clusterfuzz-testcase-minimized-audio_decoder_fuzzer-5634316373721088 Reported-by: NChris Cunningham <chcunningham@google.com> Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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