[PATCH] remove debug code from list_del()

It hasn't caught any bugs, and it is causing confusion over whether
this is a permanent part of list_del() behaviour.

include/linux/list.h

@@ -86,13 +86,12 @@ static inline void __list_del(struct list_head * prev, struct list_head * next)
 /**
  * list_del - deletes entry from list.
  * @entry: the element to delete from the list.
- * Note: list_empty on entry does not return true after this, the entry is in an undefined state.
+ * Note: list_empty on entry does not return true after this, the entry is
+ * in an undefined state.
  */
 static inline void list_del(struct list_head *entry)
 {
 	__list_del(entry->prev, entry->next);
-	entry->next = (void *) 0;
-	entry->prev = (void *) 0;
 }
 
 /**