Please check why delete at beg of doubly linkedlist is showing error

#1
#2

u are not passing the head by refernce

void deleteNode(Node** head_ref, Node* del)  
{  
    /* base case */
    if (*head_ref == NULL || del == NULL)  
        return;  
  
    /* If node to be deleted is head node */
    if (*head_ref == del)  
        *head_ref = del->next;  
  
    /* Change next only if node to be  
    deleted is NOT the last node */
    if (del->next != NULL)  
        del->next->prev = del->prev;  
  
    /* Change prev only if node to be  
    deleted is NOT the first node */
    if (del->prev != NULL)  
        del->prev->next = del->next;  
  
    /* Finally, free the memory occupied by del*/
    free(del);  
    return;  
}