Codechange: Check that CompanyMask fits into 16 bits during compilation.

src/network/network_server.cpp

@@ -775,6 +775,7 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::SendCompanyUpdate()
 {
 	Packet *p = new Packet(PACKET_SERVER_COMPANY_UPDATE);
 
+	static_assert(sizeof(_network_company_passworded) <= sizeof(uint16));
 	p->Send_uint16(_network_company_passworded);
 	this->SendPacket(p);
 	return NETWORK_RECV_STATUS_OKAY;