DHCP transmits via specified net device, so no need to create a dummy

routing table entry just to fool ipv4.c any more.

src/net/udp/dhcp.c

 	}
 
 	/* Transmit the packet */
-	if ( ( rc = udp_sendto ( conn, &sa_dhcp_server.st,
-				 dhcppkt.dhcphdr, dhcppkt.len ) ) != 0 ) {
+	if ( ( rc = udp_sendto_via ( conn, &sa_dhcp_server.st, dhcp->netdev,
+				     dhcppkt.dhcphdr, dhcppkt.len ) ) != 0 ) {
 		DBG ( "Could not transmit UDP packet\n" );
 		return rc;
 	}

src/tests/dhcptest.c

 	char filename[256];
 	int rc;
 
-	/* Bring IP interface up with address 0.0.0.0 */
-	if ( ( rc = add_ipv4_address ( netdev, address, netmask,
-				       gateway ) ) != 0 )
-		goto out_no_del_ipv4;
-
 	/* Issue DHCP request */
 	printf ( "DHCP (%s)...", netdev->name );
 	memset ( &dhcp, 0, sizeof ( dhcp ) );
 	if ( filename[0] )
 		printf ( "Bootfile name \"%s\"\n", filename );
 
-	/* Remove old IP address configuration */
-	del_ipv4_address ( netdev );
-
 	/* Set up new IP address configuration */
 	if ( ( rc = add_ipv4_address ( netdev, address, netmask,
 				       gateway ) ) != 0 )