modbus_tcp

add unused define around arg variable

project/Core/Src/modbus_tcp.c

@@ -49,6 +49,7 @@ static err_t modbus_incoming_data(void* arg, struct tcp_pcb* pcb, struct pbuf* p
     char text[TEXT_LENGTH];
     uint32_t result_background = 0xff000000;
     uint32_t text_foreground_color = 0xff000000;
+    LWIP_UNUSED_ARG(arg);
 
     // Putting underscores in the whole array
     memset(text, '_', TEXT_LENGTH);