target/tcmu: Use macro to call container_of in tcmu_cmd_time_out_show

This patch makes a tiny change that using TCMU_DEV in
tcmu_cmd_time_out_show so it is consistent with other functions.
Signed-off-by: Kenjiro Nakayama <nakayamakenjiro@gmail.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_user.c

@@ -1736,8 +1736,7 @@ static ssize_t tcmu_cmd_time_out_show(struct config_item *item, char *page)
 {
 	struct se_dev_attrib *da = container_of(to_config_group(item),
 					struct se_dev_attrib, da_group);
-	struct tcmu_dev *udev = container_of(da->da_dev,
-					struct tcmu_dev, se_dev);
+	struct tcmu_dev *udev = TCMU_DEV(da->da_dev);
 
 	return snprintf(page, PAGE_SIZE, "%lu\n", udev->cmd_time_out / MSEC_PER_SEC);
 }