aasc: fix out of array write

Closes #1619.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 8a57ca5c6a1c0ad28afa7ea6f824981e6761cce1)

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