xfs: sync xfs_btree_split macros with userspace libxfs

Sync this one last bit of discrepancy between kernel and userspace
libxfs.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Darrick J. Wong 2021-11-09 18:32:17 -08:00
commit 4a6b35b3b3