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/serverworks.c b/drivers/ide/serverworks.c
index 14718e7..b6554ef 100644
--- a/drivers/ide/serverworks.c
+++ b/drivers/ide/serverworks.c
@@ -175,7 +175,7 @@
 	pci_write_config_byte(dev, 0x54, ultra_enable);
 }
 
-static unsigned int init_chipset_svwks(struct pci_dev *dev)
+static int init_chipset_svwks(struct pci_dev *dev)
 {
 	unsigned int reg;
 	u8 btr;
@@ -270,7 +270,7 @@
 		pci_write_config_byte(dev, 0x5A, btr);
 	}
 
-	return dev->irq;
+	return 0;
 }
 
 static u8 ata66_svwks_svwks(ide_hwif_t *hwif)