Fixes: Invalid shifts
Fixes: #8166
Fixes: filter-crop_scale_vflip FATE-test
Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a6ca22c1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>