error = is needed before ether_ioctl() so that unsupported/unknown

IOCLTs are properly handled.  This gets the cs driver properly
reporting things via ifconfig.

# my pccard still doesn't work.

sys/dev/cs/if_cs.c

@@ -1151,7 +1151,7 @@ cs_ioctl(register struct ifnet *ifp, u_long command, caddr_t data)
                 break;
 
         default:
-		ether_ioctl(ifp, command, data);
+		error = ether_ioctl(ifp, command, data);
 		break;
         }