Qt: EPGView: fix constness

modules/gui/qt4/components/epg/EPGView.cpp

@@ -112,12 +112,12 @@ void EPGView::updateChannels()
     mutex.unlock();
 }
 
-const QDateTime& EPGView::startTime()
+const QDateTime& EPGView::startTime() const
 {
     return m_startTime;
 }
 
-const QDateTime& EPGView::baseTime()
+const QDateTime& EPGView::baseTime() const
 {
     return m_baseTime;
 }

modules/gui/qt4/components/epg/EPGView.hpp

@@ -58,8 +58,8 @@ public:
     void            setScale( double scaleFactor );
 
     void            updateStartTime();
-    const QDateTime& startTime();
-    const QDateTime& baseTime();
+    const QDateTime& startTime() const;
+    const QDateTime& baseTime() const;
 
     bool            addEPGEvent( vlc_epg_event_t*, QString, bool );
     void            removeEPGEvent( vlc_epg_event_t*, QString );