staging: comedi: rtd520: cleanup the "find pci device" code

static struct pci_dev *rtd_find_pci(struct comedi_device *dev,

				    struct comedi_devconfig *it)

{

	struct pci_dev *pcidev;

	for (pcidev = pci_get_device(PCI_VENDOR_ID_RTD, PCI_ANY_ID, NULL);

	     pcidev != NULL;

	     pcidev = pci_get_device(PCI_VENDOR_ID_RTD, PCI_ANY_ID, pcidev)) {

	const struct rtdBoard *thisboard;

	struct pci_dev *pcidev = NULL;

	int bus = it->options[0];

	int slot = it->options[1];

	int i;

		if (it->options[0] || it->options[1]) {

			if (pcidev->bus->number != it->options[0]

			    || PCI_SLOT(pcidev->devfn) != it->options[1]) {

	for_each_pci_dev(pcidev) {

		if (pcidev->vendor != PCI_VENDOR_ID_RTD)

			continue;

		if (bus || slot) {

			if (pcidev->bus->number != bus ||

			    PCI_SLOT(pcidev->devfn) != slot)

				continue;

		}

		for (i = 0; i < ARRAY_SIZE(rtd520Boards); i++) {

			thisboard = &rtd520Boards[i];

			if (pcidev->device == thisboard->device_id) {

				dev->board_ptr = thisboard;

				return pcidev;

			}

		for (i = 0; i < ARRAY_SIZE(rtd520Boards); ++i) {

			if (pcidev->device == rtd520Boards[i].device_id) {

				dev->board_ptr = &rtd520Boards[i];

				break;

			}

		}

		if (dev->board_ptr)

			return pcidev;	/* found one */

	}

	if (!pcidev) {

		if (it->options[0] && it->options[1]) {

			printk(KERN_INFO "No RTD card at bus=%d slot=%d.\n",

			       it->options[0], it->options[1]);

		} else {

			printk(KERN_INFO "No RTD card found.\n");

		}

	}

	dev_warn(dev->class_dev,

		"no supported board found! (req. bus/slot: %d/%d)\n",

		bus, slot);

	return NULL;

}