Use simple bool type for the block reserve failfast status, there's
short to save space as there used to be int but there's no reason for
that.
Reviewed-by: NAnand Jain <anand.jain@oracle.com>
Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>