[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/monreader.c b/drivers/s390/char/monreader.c
index 75a8831..7892550 100644
--- a/drivers/s390/char/monreader.c
+++ b/drivers/s390/char/monreader.c
@@ -320,7 +320,7 @@
 		goto out_path;
 	}
 	filp->private_data = monpriv;
-	monreader_device->driver_data = monpriv;
+	dev_set_drvdata(&monreader_device, monpriv);
 	unlock_kernel();
 	return nonseekable_open(inode, filp);
 
@@ -463,7 +463,7 @@
  *****************************************************************************/
 static int monreader_freeze(struct device *dev)
 {
-	struct mon_private *monpriv = dev->driver_data;
+	struct mon_private *monpriv = dev_get_drvdata(&dev);
 	int rc;
 
 	if (!monpriv)
@@ -487,7 +487,7 @@
 
 static int monreader_thaw(struct device *dev)
 {
-	struct mon_private *monpriv = dev->driver_data;
+	struct mon_private *monpriv = dev_get_drvdata(dev);
 	int rc;
 
 	if (!monpriv)