btrfs: zoned: use helper to check a power of two zone size

We have a 64bit compatible helper to check if a value is a power of two,
use it instead of open coding it.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/zoned.c

@@ -394,8 +394,7 @@ int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache)
 		zone_sectors = bdev_zone_sectors(bdev);
 	}
 
-	/* Check if it's power of 2 (see is_power_of_2) */
-	ASSERT(zone_sectors != 0 && (zone_sectors & (zone_sectors - 1)) == 0);
+	ASSERT(is_power_of_two_u64(zone_sectors));
 	zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
 
 	/* We reject devices with a zone size larger than 8GB */