[ARM] 4382/1: iop13xx: fix msi support

updates iop13xx msi support for a msi api change in 2.6.22

rev7:
* update for Michael Ellerman's "MSI: arch must connect the irq and the
  msi_desc" patch
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-iop13xx/msi.c

@@ -190,5 +190,5 @@ int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
 	write_msi_msg(irq, &msg);
 	set_irq_chip_and_handler(irq, &iop13xx_msi_chip, handle_simple_irq);
 
-	return irq;
+	return 0;
 }