Print listening socket error code as well on bind failure

src/server/socket/listeningsocket.cpp

@@ -41,7 +41,7 @@ ListeningSocket::ListeningSocket(int const port)
 		sizeof(sockaddr_in));
 	if (bindResult < 0)
 	{
-		throw std::runtime_error("socket bind error");
+		throw std::runtime_error("socket bind error code " + std::to_string(errno));
 	}
 
 	int const listenResult = listen(socketFileDescriptor, connectionLimit);