下面的代码片段用于在双向链表中删除一个节点。请在横线处填入（     ），使其能正确实现相应功能。

void deleteNode(DoublyListNode*& head, int value) { 

DoublyListNode* current = head;

while (current != nullptr && current->val != value) {

current = current->next;

}

if (current != nullptr) {

if (current->prev != nullptr) {

____________________________________ // 在此处填入代码

} else {

head = current->next;

}

if (current->next != nullptr) {

current->next->prev = current->prev;

}

delete current;

}

}