How do you delete last element from link list?

void

delete_last (node **head)

{

node *tmp = *head;

node *prev = NULL;

if (!tmp) {

} else if (!tmp->next) {

free(tmp);

*head = NULL;

} else {

while (tmp->next) {

prev = tmp;

tmp = tmp->next;

}

prev->next = NULL;

free(tmp);

}

return;

}