[driver model] Actually implement sysdev_{create,remove}_file().

drivers/base/sys.c

@@ -62,6 +62,19 @@ static struct kobj_type ktype_sysdev = {
 	.sysfs_ops	= &sysfs_ops,
 };
 
+
+int sysdev_create_file(struct sys_device * s, struct sysdev_attribute * a)
+{
+	return sysfs_create_file(&s->kobj,&a->attr);
+}
+
+
+void sysdev_remove_file(struct sys_device * s, struct sysdev_attribute * a)
+{
+	sysfs_remove_file(&s->kobj,&a->attr);
+}
+
+
 /* 
  * declare system_subsys 
  */