s390/scm: reorder scm_remove

Do not reset drvdata before the block device is cleaned up. With a
non-empty block queue drvdata could be accessed.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/scm_drv.c b/drivers/s390/block/scm_drv.c
index 349966f..9fa0a90 100644
--- a/drivers/s390/block/scm_drv.c
+++ b/drivers/s390/block/scm_drv.c
@@ -52,8 +52,8 @@
 {
 	struct scm_blk_dev *bdev = dev_get_drvdata(&scmdev->dev);
 
-	dev_set_drvdata(&scmdev->dev, NULL);
 	scm_blk_dev_cleanup(bdev);
+	dev_set_drvdata(&scmdev->dev, NULL);
 	kfree(bdev);
 
 	return 0;