[PATCH] Change list_emtpy() to take a const pointer

From:  "Perez-Gonzalez, Inaky" <inaky.perez-gonzalez@intel.com>

include/linux/list.h

@@ -203,7 +203,7 @@ static inline void list_move_tail(struct list_head *list,
  * list_empty - tests whether a list is empty
  * @head: the list to test.
  */
-static inline int list_empty(struct list_head *head)
+static inline int list_empty(const struct list_head *head)
 {
 	return head->next == head;
 }