avformat/mov: Check that we have a stream before accessing it in mov_read_ares()
Fixes out of array read
Fixes: signal_sigsegv_6f1855_3910_avid_test_alpha.mov
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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