fix Warning

qt6-after/qt6-migrated-legatus/Lts/Proxies/Buildings/BuildingControlUnit/bcu_xml_reader.cpp

@@ -32,13 +32,11 @@ QDomElement readFile(const QString &fn, const QString &rootTag)
     return QDomElement();
   }
 
-  QString errMsg;
-  int errLine = 0;
-  int errColumn = 0;
   QDomDocument doc;
-  if (!doc.setContent(data, &errMsg, &errLine, &errColumn))
+  const auto parseResult = doc.setContent(data);
+  if (!parseResult)
   {
-    WARNING_LOG(logger()) << "Could not parse xml file '" << fn << "' at " << errLine << ":" << errColumn << ": " << errMsg;
+    WARNING_LOG(logger()) << "Could not parse xml file '" << fn << "' at " << int(parseResult.errorLine) << ":" << int(parseResult.errorColumn) << ": " << parseResult.errorMessage;
     return QDomElement();
   }