swscale/swscale: Fix several invalid shifts related to vChrDrop

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>
pull/343/head
Michael Niedermayer 5 years ago
parent a00fa73f47
commit a6ca22c118
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