btrfs-progs: impossible BUG_ON meant to test empty

old_left_nritems is unsigned so BUG_ON(old_left_nritems < 0) is
impossible.  Presumably the BUG_ON() meant to test that it wasn't 0 so
that btrfs_item_offset_nr() doesn't get a nr of -1.

Signed-off-by: Zach Brown <zab@redhat.com>

diff --git a/ctree.c b/ctree.c
index 848722c..1778a51 100644 (file)
--- a/ctree.c
+++ b/ctree.c
@@ -1960,7 +1960,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
                     btrfs_item_offset_nr(right, push_items - 1),
                     push_space);
        old_left_nritems = btrfs_header_nritems(left);
-       BUG_ON(old_left_nritems < 0);
+       BUG_ON(old_left_nritems == 0);
 
        old_left_item_size = btrfs_item_offset_nr(left, old_left_nritems - 1);
        for (i = old_left_nritems; i < old_left_nritems + push_items; i++) {