vp6: Fix illegal read.

Found with Address Sanitizer

Signed-off-by: Alex Converse <alex.converse@gmail.com>
(cherry picked from commit e0966eb140b3569b3d6b5b5008961944ef229c06)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 8a63deab15ef41fd439be1b46d8dcb73669ccfc1)

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