高手帮忙调试一下，谢谢
#include "stdio.h"
#include "malloc.h"
#define LEN sizeof(struct list)
struct list
    {
        int num;
        struct list *next;
    };
   
    struct list *creat()
    {   struct list *head;
        struct list *p1,*p2;
        int n=0;
        p1=p2=(struct list *)malloc(LEN);
        scanf("%d",p1->num);
        head=NULL;
        while(p1->num!=0)
        {
            if(n==1)head=p1;
            else p2->next=p1;
            p2=p1;
            p1=(struct list *)malloc(LEN);
            scanf("%d",p1->num);
            p2->next=NULL;
            return(head);        
        }
    }
void main()
{
   struct list *p;
   p=creat();
   while(p!=NULL)
   {
       printf("%d\n",p->num);
    p=p->next;
   }
}

谢啦