Fix: prevent clients making emergency saves twice if server disconnects (#8477)

This was clearly overlooked during the initial implementation.

src/network/network_client.cpp

@@ -211,15 +211,22 @@ void ClientNetworkGameSocketHandler::ClientError(NetworkRecvStatus res)
 		default:                                  errorno = NETWORK_ERROR_GENERAL; break;
 	}
 
-	/* This means we fucked up and the server closed the connection */
-	if (res != NETWORK_RECV_STATUS_SERVER_ERROR && res != NETWORK_RECV_STATUS_SERVER_FULL &&
-			res != NETWORK_RECV_STATUS_SERVER_BANNED) {
+	if (res == NETWORK_RECV_STATUS_SERVER_ERROR || res == NETWORK_RECV_STATUS_SERVER_FULL ||
+			res == NETWORK_RECV_STATUS_SERVER_BANNED) {
+		/* This means the server closed the connection. Emergency save is
+		 * already created if this was appropriate during handling of the
+		 * disconnect. */
+		this->CloseConnection(res);
+	} else {
+		/* This means we as client made a boo-boo. */
 		SendError(errorno);
-	}
 
-	this->CloseConnection(res);
-
-	ClientNetworkEmergencySave();
+		/* Close connection before we make an emergency save, as the save can
+		 * take a bit of time; better that the server doesn't stall while we
+		 * are doing the save, and already disconnects us. */
+		this->CloseConnection(res);
+		ClientNetworkEmergencySave();
+	}
 
 	_switch_mode = SM_MENU;
 	_networking = false;