bmv_videodec: fix out of array read

Fixes Ticket1373

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 70f0ffa1ed456fd0b560d0dd1d0d93f1ba3a6d93)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
1 file changed