btrfs: get fs_info from block group in next_block_group

We can read fs_info from the block group cache structure and can drop it
from the parameters.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-03-20 12:01:07 +01:00
commit f87b7eb821