c语言单链表问题，不知道方框里错哪了

NODE * create()
{
    NODE *p, *q,*current;
    int x;
    current=(NODE*)malloc(sizeof(NODE));
    current->next=NULL;
    q=current;
    while(1)
    {
        scanf("%d",&x);
        if(x == -1) break;
        p=(NODE*)malloc(sizeof(NODE));
        p->data=x;
        p->next=NULL;
        q->next=p;
        q=p;
    }
    return current;
}