driver core: move knode_driver into private structure

Nothing outside of the driver core should ever touch knode_driver, so
move it out of the public eye.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 2889ad5..c51f11b 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -19,7 +19,14 @@
 static struct device *next_device(struct klist_iter *i)
 {
 	struct klist_node *n = klist_next(i);
-	return n ? container_of(n, struct device, knode_driver) : NULL;
+	struct device *dev = NULL;
+	struct device_private *dev_prv;
+
+	if (n) {
+		dev_prv = to_device_private_driver(n);
+		dev = dev_prv->device;
+	}
+	return dev;
 }
 
 /**
@@ -42,7 +49,7 @@
 		return -EINVAL;
 
 	klist_iter_init_node(&drv->p->klist_devices, &i,
-			     start ? &start->knode_driver : NULL);
+			     start ? &start->p->knode_driver : NULL);
 	while ((dev = next_device(&i)) && !error)
 		error = fn(dev, data);
 	klist_iter_exit(&i);
@@ -76,7 +83,7 @@
 		return NULL;
 
 	klist_iter_init_node(&drv->p->klist_devices, &i,
-			     (start ? &start->knode_driver : NULL));
+			     (start ? &start->p->knode_driver : NULL));
 	while ((dev = next_device(&i)))
 		if (match(dev, data) && get_device(dev))
 			break;