[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/con3215.c b/drivers/s390/char/con3215.c
index 51e6379..21639d6 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -732,7 +732,7 @@
 	unsigned long flags;
 
 	/* Empty the output buffer, then prevent new I/O. */
-	raw = cdev->dev.driver_data;
+	raw = dev_get_drvdata(&cdev->dev);
 	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 	raw3215_make_room(raw, RAW3215_BUFFER_SIZE);
 	raw->flags |= RAW3215_FROZEN;
@@ -746,7 +746,7 @@
 	unsigned long flags;
 
 	/* Allow I/O again and flush output buffer. */
-	raw = cdev->dev.driver_data;
+	raw = dev_get_drvdata(&cdev->dev);
 	spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
 	raw->flags &= ~RAW3215_FROZEN;
 	raw->flags |= RAW3215_FLUSHING;