ide: fix ->init_chipset method to return 'int' value

* Return 0 instead of dev->irq in ->init_chipset implementations.

* Fix ->init_chipset method to return 'int' value instead of
  'unsigned int' one.

This fixes ->init_chipset handling for host drivers (cs5530, hpt366
and pdc202xx_new) for which it is possible for this method to fail.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/siimage.c b/drivers/ide/siimage.c
index cb2b352..1811ae9 100644
--- a/drivers/ide/siimage.c
+++ b/drivers/ide/siimage.c
@@ -464,7 +464,7 @@
  *	to 133 MHz clocking if the system isn't already set up to do it.
  */
 
-static unsigned int init_chipset_siimage(struct pci_dev *dev)
+static int init_chipset_siimage(struct pci_dev *dev)
 {
 	struct ide_host *host = pci_get_drvdata(dev);
 	void __iomem *ioaddr = host->host_priv;