class: rename "interfaces" to "class_interfaces" in internal class structure

This renames the struct class "interfaces" field to be
"class_interfaces" to make things easier when struct bus_type and struct
class merge in the future.  It also makes grepping for fields easier as
well.

Based on an idea from Kay.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 9947560..48b518e 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -144,7 +144,7 @@
 	if (!cp)
 		return -ENOMEM;
 	INIT_LIST_HEAD(&cp->class_devices);
-	INIT_LIST_HEAD(&cp->interfaces);
+	INIT_LIST_HEAD(&cp->class_interfaces);
 	kset_init(&cp->class_dirs);
 	init_MUTEX(&cp->sem);
 	error = kobject_set_name(&cp->subsys.kobj, "%s", cls->name);
@@ -372,7 +372,7 @@
 		return -EINVAL;
 
 	down(&parent->p->sem);
-	list_add_tail(&class_intf->node, &parent->p->interfaces);
+	list_add_tail(&class_intf->node, &parent->p->class_interfaces);
 	if (class_intf->add_dev) {
 		list_for_each_entry(dev, &parent->p->class_devices, node)
 			class_intf->add_dev(dev, class_intf);