avformat/matroskaenc: Check alpha_mode
Fixes CID1231992 Suggested-by: Timothy Gu <timothygu99@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Fixes CID1231992 Suggested-by: Timothy Gu <timothygu99@gmail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>