在这段代码中我有一个警告：控制到达非空函数的末尾[-Wreturn-type]。我怎样才能解决这个问题？

int Linkedlist::count_value_type(Node* head_ptr, const Node::value_type& target)
{
    Node* current;
    int total = 0;

    for(current = head_ptr; current !=NULL; current = current->getLink())
    {
        if(target == current->getData())
        {
            ++total;
        }

    return 0;
    }
}
int Linkedlist::count_value_type(Node* head_ptr