fix args to _disable routine

src/arch/i386/drivers/net/undi.c

 /**************************************************************************
 DISABLE - Turn off ethernet interface
 ***************************************************************************/
-static void undi_disable ( struct nic *nic __unused,
-			   struct pci_device *pci __unused ) {
+static void undi_disable ( struct nic *nic __unused ) {
 	undi_full_shutdown();
 	free_base_mem_data();
 }