The switch from pointers to addresses (commit
026aeffc and
ffaf8577) added
a off-by-one bug to 16bit backward blits.  Fix.
Reported-by: N李强 <liqiang6-s@360.cn>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NLi Qiang <liqiang6-s@360.cn>
Message-id: 1489735296-19047-1-git-send-email-kraxel@redhat.com