About func in lists.c

[Zheng Yuan {ZYUAN1}]

Hi, all
 
i have a question about func as bellows

/**
 * add_head - prepend a node to a list
 * @l: linked list
 * @n: list node
 *
 * add_head() takes a node @n and prepends it at the start of the list @l.
 */ LIST_INLINE void add_head(list *l, node *n) {
  node *z = l->head;
  n->next = z;
  n->prev = (node *) &l->head;
  z->prev = n;
  l->head = n; }

isnt that we should change n->prev = (node *) &l->head to n->prev = (node
*) &l->null