avcodec/alsdec: skip cases where the master channel equals the current channel
Fixes: msan_uninit-mem_7f6c73c97cf9_3571_als_04_2ch48k16b.mp4 Fixes use of uninitialized memory Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Reviewed-by:Thilo Borgmann <thilo.borgmann@mail.de> Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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