btrfs: switch seeding_dev in init_new_device to bool

Declare int seeding_dev as a bool. Also, move its declaration a line
below to adjust packing.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>