[ALSA] check return code in pnp_register_card_driver()

int pnp_register_card_driver(struct pnp_card_driver * drv)

{

	int count = 0;

	int count;

	struct list_head *pos, *temp;

	drv->link.name = drv->name;

	drv->link.suspend = drv->suspend ? card_suspend : NULL;

	drv->link.resume = drv->resume ? card_resume : NULL;

	count = pnp_register_driver(&drv->link);

	if (count < 0)

		return count;

	spin_lock(&pnp_lock);

	list_add_tail(&drv->global_list, &pnp_card_drivers);

	spin_unlock(&pnp_lock);

	pnp_register_driver(&drv->link);

	count = 0;

	list_for_each_safe(pos,temp,&pnp_cards){

		struct pnp_card *card = list_entry(pos, struct pnp_card, global_list);