dm/zone: Use the enum req_op type

Use the enum req_op type for request operations instead of unsigned int.
This patch fixes a sparse warning that has been introduced by making
enum req_op __bitwise.

Reviewed-by: Damien Le Moal <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: bvanassche

drivers/md/dm-zone.c

@@ -359,7 +359,7 @@ static int dm_update_zone_wp_offset(struct mapped_device *md, unsigned int zno,
 }
 
 struct orig_bio_details {
-	unsigned int op;
+	enum req_op op;
 	unsigned int nr_sectors;
 };