[PATCH -next] ublk: Fix signedness bug returning warning

[Li Zetao <lizetao1@huawei.com>]

There are two warnings reported by smatch:

drivers/block/ublk_drv.c:445 ublk_setup_iod_zoned() warn:
	signedness bug returning '(-95)'
drivers/block/ublk_drv.c:963 ublk_setup_iod() warn:
	signedness bug returning '(-5)'

The type of "blk_status_t" is either be a u32 or u8, but this two
functions return a negative value when not supported or failed. Use
the error code of the blk module to fix these warnings.

Fixes: 29802d7ca33b ("ublk: enable zoned storage support")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202308100201.TCRhgdvN-lkp@intel.com/
Signed-off-by: Li Zetao <lizetao1@huawei.com>
---
 drivers/block/ublk_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index 85a81ee556d5..ef1760b3d8b5 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -442,7 +442,7 @@ static int ublk_revalidate_disk_zones(struct ublk_device *ub)
 static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq,
 					 struct request *req)
 {
-	return -EOPNOTSUPP;
+	return BLK_STS_NOTSUPP;
 }
 
 #endif
@@ -960,7 +960,7 @@ static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req)
 
 	if (!ublk_queue_is_zoned(ubq) &&
 	    (op_is_zone_mgmt(op) || op == REQ_OP_ZONE_APPEND))
-		return -EIO;
+		return BLK_STS_IOERR;
 
 	switch (req_op(req)) {
 	case REQ_OP_READ:
-- 
2.34.1