W1: ioremap balanced with iounmap

ioremap must be balanced with iounmap in error path.

Please consider for 2.6.19.
Signed-off-by: NAmol Lad <amol@verismonetworks.com>
Signed-off-by: NEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/w1/masters/matrox_w1.c

@@ -215,6 +215,8 @@ static int __devinit matrox_w1_probe(struct pci_dev *pdev, const struct pci_devi
 	return 0;
 
 err_out_free_device:
+	if (dev->virt_addr)
+		iounmap(dev->virt_addr);
 	kfree(dev);
 
 	return err;