xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff()

xfs: Fix off-by-in in loop termination in xfs_find_get_desired_pgoff()

There is an off-by-one error in loop termination conditions in
xfs_find_get_desired_pgoff() since 'end' may index a page beyond end of
desired range if 'endoff' is page aligned. It doesn't have any visible
effects but still it is good to fix it.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Orabug: 27093425

(backport upstream commit d7fd24257aa60316bf81093f7f909dc9475ae974)

Signed-off-by: Shan Hai <shan.hai@oracle.com>