btrfs: scrub: use bool for flush_all_writes

flush_all_writes is an atomic but does not use the semantics at all,
it's just on/off indicator, we can use bool.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-03-31 17:12:51 +02:00
commit 2073c4c2e5