unbind_from_irqhandler takes irq, not evtchn, as its first argument.

Signed-off-by: Rafal Wojtczuk <rafal@invisiblethingslab.com>
--- linux-2.6.34.1/drivers/xen/pcifront/xenbus.c.orig	2010-09-29 16:47:39.961674359 +0200
+++ linux-2.6.34.1/drivers/xen/pcifront/xenbus.c	2010-09-29 16:47:49.458675391 +0200
@@ -61,7 +61,7 @@ static void free_pdev(struct pcifront_de
 
 	/*For PCIE_AER error handling job*/
 	flush_scheduled_work();
-	unbind_from_irqhandler(pdev->evtchn, pdev);
+	unbind_from_irqhandler(irq_from_evtchn(pdev->evtchn), pdev);
 
 	if (pdev->evtchn != INVALID_EVTCHN)
 		xenbus_free_evtchn(pdev->xdev, pdev->evtchn);