This is what mentioned in the comment to the line, so implement just that

V560 A part of conditional expression is always true:
     pBand->mnYTop < pBand->mnYBottom.

Change-Id: I1027a30a07d49940a31838deddb457b6379eb887
Reviewed-on: https://gerrit.libreoffice.org/64399
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>