Fix memleaks: Fill in the destructor of simple preference.

modules/gui/qt4/components/simple_preferences.cpp

@@ -568,6 +568,18 @@ void SPrefsPanel::updateAudioOptions( int number)
     optionWidgets[fileW]->setVisible( ( value == "aout_file" ) );
 }
 
+
+SPrefsPanel::~SPrefsPanel()
+{
+    QList<ConfigControl *>::Iterator conf_it;
+    for( conf_it = controls.begin() ; conf_it != controls.end() ; conf_it++ )
+    {
+        ConfigControl *c = qobject_cast<ConfigControl *>(*conf_it);
+        delete c;
+    }
+    controls.clear();
+}
+
 void SPrefsPanel::updateAudioVolume( int volume )
 {
     qobject_cast<QSpinBox *>(optionWidgets[volLW])

modules/gui/qt4/components/simple_preferences.hpp

@@ -105,7 +105,7 @@ class SPrefsPanel : public QWidget
     Q_OBJECT
 public:
     SPrefsPanel( intf_thread_t *, QWidget *, int );
-    virtual ~SPrefsPanel() {};
+    virtual ~SPrefsPanel();
     void apply();
     void clean();
 private: