Fixed DHCP wrong time elapsed value write.

Author: Juha Heiskanen

source/libDHCPv6/dhcp_service_api.c

@@ -794,7 +794,7 @@ uint32_t dhcp_service_send_req(uint16_t instance_id, uint8_t options, void *ptr,
     msg_tr_ptr->socket = dhcp_service->dhcp_client_socket;
     msg_tr_ptr->recv_resp_cb = receive_resp_cb;
     msg_tr_ptr->delayed_tx = delay_tx;
-    msg_tr_ptr->first_transmit_time = protocol_core_monotonic_time + delay_tx;
+    msg_tr_ptr->first_transmit_time = protocol_core_monotonic_time;
     dhcp_tr_set_retry_timers(msg_tr_ptr, msg_tr_ptr->msg_ptr[0]);
     common_write_24_bit(msg_tr_ptr->msg_tr_id, &msg_tr_ptr->msg_ptr[1]);