xfs: code cleanup in xfs_attr_leaf_entsize_{remote,local}

xfs: code cleanup in xfs_attr_leaf_entsize_{remote,local}

Source kernel commit: 61ef5230518a3ad224549a50a01b73989acb94b9

Cleanup the typedef usage, the unnecessary parentheses, the unnecessary
backslash and use the open-coded round_up call in
xfs_attr_leaf_entsize_{remote,local}.

Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>