delete by value

#include<stdio.h>
#include<stdlib.h>

typedef struct st_info
{
    char name;
    int roll;
    struct st_info *next;

} data;

data *head;
data *temp;
data *temp1;
int count=0;
void display()
{
    data *list = head;
    while(list != NULL)
    {
        printf("%c\n",list -> name);
        printf("%d\n",list -> roll);
        list = list -> next;
    }
}

void delete(int n)
{
    data *list = head;
    while(list != NULL)
    {
        if(list -> roll == n)
        {
            if(count>0)
            {

                temp = temp1 -> next;
                temp1 -> next= temp -> next;
                free(temp);
            }
            else
            {

            head =head -> next;
            free(list);
            return;
            }

        }
        temp1=list;
        list = list -> next;
        count++;
    }
}


int main()
{
    data *p = (data*)malloc(sizeof(data));
    p -> name = 'z';
    p -> roll = 5;
    p -> next = NULL;

    data *q = (data*)malloc(sizeof(data));
    q -> name = 'x';
    q -> roll = 6;
    q -> next = NULL;

    data *r = (data*)malloc(sizeof(data));
    r -> name = 'y';
    r -> roll = 7;
    r -> next = NULL;

    q -> next = r;
    p -> next = q;
    head = p;
    delete(5);
    display();
}