pdc202xx_new: fix Promise TX4 support

In case of Promise TX4 the first PCI device is located at slot 1
and the second one is at slot 2 so the offset used by pci_get_slot()
should be "+1" and not "+2".

Thanks goes out to Markus Dietz for bugreport and testing this patch.

Cc: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/pci/pdc202xx_new.c

@@ -482,8 +482,9 @@ static struct pci_dev * __devinit pdc20270_get_dev2(struct pci_dev *dev)
 {
 	struct pci_dev *dev2;
 
-	dev2 = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn) + 2,
+	dev2 = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn) + 1,
 						PCI_FUNC(dev->devfn)));
+
 	if (dev2 &&
 	    dev2->vendor == dev->vendor &&
 	    dev2->device == dev->device) {