btrfs: remove pointless return value update in btrfs_del_items()

The call to btrfs_del_leaf() can only return an error (negative value) or
zero (success). If we didn't get an error then 'ret' is zero, so it's
pointless to set it to zero again.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: fdmanana

fs/btrfs/ctree.c

@@ -4589,7 +4589,6 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 				free_extent_buffer(leaf);
 				if (ret < 0)
 					return ret;
-				ret = 0;
 			} else {
 				/* if we're still in the path, make sure
 				 * we're dirty.  Otherwise, one of the