btrfs: remove unused function heads_to_leaves

There's no callers in-tree anymore since commit 64403612b7 ("btrfs:
rework btrfs_check_space_for_delayed_refs")

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
YueHaibing 2020-05-06 21:22:39 +08:00 • committed by David Sterba
commit eec5b6e097