QtDialog/FirstConfigure: remove 'return' from void expression

Source/QtDialog/FirstConfigure.cxx

@@ -301,7 +301,7 @@ QString CrossCompilerSetup::getFindRoot() const
 
 void CrossCompilerSetup::setFindRoot(const QString& t)
 {
-  return this->crossFindRoot->setText(t);
+  this->crossFindRoot->setText(t);
 }
 
 int CrossCompilerSetup::getProgramMode() const