btrfs: Use explicit round_down call rather than open-coding it

No functional changes.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2017-06-27 10:02:25 +03:00 • committed by David Sterba
commit e5600fd6fc