btrfs: relocation: Remove redundant tree level check

Commit 581c1760415c ("btrfs: Validate child tree block's level and first
key") has made tree block level check mandatory.

So if tree block level doesn't match, we won't get a valid extent
buffer.  The extra WARN_ON() check can be removed completely.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 0c1bc7df06a2ef571c38f8494941c67c1cc1d6bb..924116f654a110cb9e23a878002bed0ae967029e 100644 (file)
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2915,7 +2915,6 @@ static int get_tree_block_key(struct btrfs_fs_info *fs_info,
                free_extent_buffer(eb);
                return -EIO;
        }
-       WARN_ON(btrfs_header_level(eb) != block->level);
        if (block->level == 0)
                btrfs_item_key_to_cpu(eb, &block->key, 0);
        else