mpc8: fix channel checks

fix heap array overflow

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 44c10168cff41c200825448b77cb8feff0d316c9)

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