driver core: class: make class_dev_iter_init() options const

class_dev_iter_init() does not modify the struct class or the struct
device passed into it, so mark them as const * to enforce that.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230313181843.1207845-5-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/class.c

@@ -284,8 +284,8 @@ EXPORT_SYMBOL_GPL(class_destroy);
  * otherwise if it is NULL, the iteration starts at the beginning of
  * the list.
  */
-void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,
-			 struct device *start, const struct device_type *type)
+void class_dev_iter_init(struct class_dev_iter *iter, const struct class *class,
+			 const struct device *start, const struct device_type *type)
 {
 	struct klist_node *start_knode = NULL;
 

include/linux/device/class.h

@@ -103,8 +103,8 @@ void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 			      struct device *device_link);
 
 extern void class_dev_iter_init(struct class_dev_iter *iter,
-				struct class *class,
-				struct device *start,
+				const struct class *class,
+				const struct device *start,
 				const struct device_type *type);
 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 extern void class_dev_iter_exit(struct class_dev_iter *iter);