[sky2] Fix invalid memory access

Use hw pointer in PCI driver data as expected by sky2_remove().

Signed-off-by: Valentine Barshak <gvaxon@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/sky2.c

 			sky2_show_addr(dev1);
 	}
 
-	pci_set_drvdata(pdev, dev);
+	pci_set_drvdata(pdev, hw);
 
 	return 0;