Btrfs: balance_level checks !child after access

The BUG_ON() is in the wrong spot.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 35443cc4b9a9..6674692f7023 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -917,9 +917,9 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 
                 /* promote the child to a root */
                 child = read_node_slot(root, mid, 0);
+                BUG_ON(!child);
                 btrfs_tree_lock(child);
                 btrfs_set_lock_blocking(child);
-                BUG_ON(!child);
                 ret = btrfs_cow_block(trans, root, child, mid, 0, &child, 0);
                 BUG_ON(ret);