If acmax can be 0 then it could result in a division by 0 Fixes CID1351345 Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Silences: CID1351397 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Paul B Mahol <onemda@gmail.com>