Driver class: remove possible oops

This happens when the device associated with a class device goes away before
the class does.

drivers/base/class.c

@@ -155,7 +155,6 @@ static int class_device_dev_link(struct class_device * class_dev)
 
 static void class_device_dev_unlink(struct class_device * class_dev)
 {
-	if (class_dev->dev)
 	sysfs_remove_link(&class_dev->kobj, "device");
 }
 
@@ -169,7 +168,6 @@ static int class_device_driver_link(struct class_device * class_dev)
 
 static void class_device_driver_unlink(struct class_device * class_dev)
 {
-	if ((class_dev->dev) && (class_dev->dev->driver))
 	sysfs_remove_link(&class_dev->kobj, "driver");
 }