ide: fix ide_intr() for non-PCI devices and CONFIG_BLK_DEV_IDEPCI=y

'hwif->pci_dev && !hwif->pci_dev->vendor' condition is never true,
check for 'hwif->chipset != ide_pci' instead.

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