[PATCH 4/4] btrfs: remove redundant level reset in btrfs_del_items()

[Sun YangKai <sunk67188@gmail.com>]

When btrfs_del_items() empties a leaf, it deletes the leaf unless it's
the root node. For the root leaf case, the code used to reset its level
to 0 via btrfs_set_header_level(). This is redundant as leaf nodes
always have level == 0.

Remove the unnecessary level assignment and invert the conditional to
handle only the non-root leaf deletion. The root leaf is correctly left
as-is.

No functional change.

Signed-off-by: Sun YangKai <sunk67188@gmail.com>
---
 fs/btrfs/ctree.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 0ef80f2a2a8b..3c4aea71bbbf 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -4524,9 +4524,7 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 
 	/* delete the leaf if we've emptied it */
 	if (nritems == 0) {
-		if (leaf == root->node) {
-			btrfs_set_header_level(leaf, 0);
-		} else {
+		if (leaf != root->node) {
 			btrfs_clear_buffer_dirty(trans, leaf);
 			ret = btrfs_del_leaf(trans, root, path, leaf);
 			if (ret < 0)
-- 
2.51.0