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;
}
}