[S390] driver_data access

Replace the remaining direct accesses to the driver_data pointer
with calls to the dev_get_drvdata() and dev_set_drvdata() functions.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
index 7d9e67c..31b902e 100644
--- a/drivers/s390/char/vmur.c
+++ b/drivers/s390/char/vmur.c
@@ -170,7 +170,7 @@
  */
 static int ur_pm_suspend(struct ccw_device *cdev)
 {
-	struct urdev *urd = cdev->dev.driver_data;
+	struct urdev *urd = dev_get_drvdata(&cdev->dev);
 
 	TRACE("ur_pm_suspend: cdev=%p\n", cdev);
 	if (urd->open_flag) {