KCM: Use an existing `stream` when write configuration files

instead of defining a new `fileDataStream`.

This also resolves FTBFS from prior commit.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit b0aa8546df)

kcm_gtk/kcmgtk.cpp

@@ -413,6 +413,7 @@ void KcmGtk::save()
 	TQFile file(TQDir::homeDirPath() + "/" + GTK_RC_FILE);
 	file.open(IO_WriteOnly);
 	TQTextStream stream(&file);
+	stream.setEncoding(TQTextStream::Locale);
 
 	TQFont selectedFont(widget->fontKde->isChecked() ? TQApplication::font() : font);
 	TQString fontName = selectedFont.family() + " " +
@@ -509,9 +510,8 @@ void KcmGtk::save()
 	if (file.exists())
 	{
 		file.open(IO_ReadOnly);
-		TQTextStream fileDataStream = TQTextStream(&file);
+		stream.setDevice(TQT_TQIODEVICE(&file));
-		fileDataStream.setEncoding(TQTextStream::Locale);
+		TQString fileDataString = stream.read();
-		TQString fileDataString = fileDataStream.read();
 		file.close();
 
 		TQString rcLine = "export GTK2_RC_FILES=$HOME/.gtkrc-2.0";