程序代码：

struct ListNode *deletem( struct ListNode *L, int m )
{
    struct ListNode *p;
    struct ListNode *pre;
    pre=L;
    p=pre->next;
    if(pre->data==m)
    {
        L=p;
        free(pre);
    }
    while(p!=NULL)
    {
        if(p->data==m)
        {
            pre->next=p->next;
            free(p);
            p->next=NULL;
        }
        pre=pre->next;
        p=p->next;
    }
    return L;
}