btrfs: tree-checker: don't fail on empty extent roots for extent tree v2

For extent tree v2 we can definitely have empty extent roots, so skip
this particular check if we have that set.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-12-15 15:40:05 -05:00 • committed by David Sterba
commit c2fa821cc9