[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/net/netiucv.c b/drivers/s390/net/netiucv.c
index 52574ce..8c36eaf 100644
--- a/drivers/s390/net/netiucv.c
+++ b/drivers/s390/net/netiucv.c
@@ -1307,7 +1307,7 @@
  */
 static int netiucv_pm_freeze(struct device *dev)
 {
-	struct netiucv_priv *priv = dev->driver_data;
+	struct netiucv_priv *priv = dev_get_drvdata(dev);
 	struct net_device *ndev = NULL;
 	int rc = 0;
 
@@ -1331,7 +1331,7 @@
  */
 static int netiucv_pm_restore_thaw(struct device *dev)
 {
-	struct netiucv_priv *priv = dev->driver_data;
+	struct netiucv_priv *priv = dev_get_drvdata(dev);
 	struct net_device *ndev = NULL;
 	int rc = 0;