ublk: pass 'const struct ublk_io *' to ublk_[un]map_io()

Pass 'const struct ublk_io *' to ublk_[un]map_io() since just io->addr
and io->res are read in the two helpers.

Signed-off-by: Ming Lei <[email protected]>

Author: Ming Lei

drivers/block/ublk_drv.c

@@ -995,7 +995,7 @@ static inline bool ublk_need_unmap_req(const struct request *req)
 }
 
 static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
-		struct ublk_io *io)
+		       const struct ublk_io *io)
 {
 	const unsigned int rq_bytes = blk_rq_bytes(req);
 
@@ -1019,7 +1019,7 @@ static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
 
 static int ublk_unmap_io(const struct ublk_queue *ubq,
 		const struct request *req,
-		struct ublk_io *io)
+		const struct ublk_io *io)
 {
 	const unsigned int rq_bytes = blk_rq_bytes(req);