xfs: make full use of xfs_btree_stage_ifakeroot in xfs_bmbt_stage_cursor

Remove the duplicate cur->bc_nlevels assignment in xfs_bmbt_stage_cursor,
and move the cur->bc_ino.forksize assignment into
xfs_btree_stage_ifakeroot as it is part of setting up the fake btree
root.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_bmap_btree.c

@@ -612,8 +612,6 @@ xfs_bmbt_stage_cursor(
 
 	/* data fork always has larger maxheight */
 	cur = xfs_bmbt_init_common(mp, NULL, ip, XFS_DATA_FORK);
-	cur->bc_nlevels = ifake->if_levels;
-	cur->bc_ino.forksize = ifake->if_fork_size;
 
 	/* Don't let anyone think we're attached to the real fork yet. */
 	cur->bc_ino.whichfork = -1;

fs/xfs/libxfs/xfs_btree_staging.c

@@ -133,6 +133,7 @@ xfs_btree_stage_ifakeroot(
 
 	cur->bc_ino.ifake = ifake;
 	cur->bc_nlevels = ifake->if_levels;
+	cur->bc_ino.forksize = ifake->if_fork_size;
 	cur->bc_flags |= XFS_BTREE_STAGING;
 }