btrfs: use raid_attr table in get_profile_num_devs

The dev_max constraints are defined in the raid_attr table, use it
instead of open-coding it.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-05-17 11:43:20 +02:00
commit 9fa02ac75b