GstEngine: Remove unused variables

src/engine/gstengine.cpp

@@ -87,8 +87,6 @@ GstEngine::GstEngine(TaskManager *task_manager, QObject *parent)
       stereo_balance_(0.0F),
       equalizer_enabled_(false),
       equalizer_preamp_(0),
-      can_decode_success_(false),
-      can_decode_last_(false),
       seek_timer_(new QTimer(this)),
       waiting_to_seek_(false),
       seek_pos_(0),

src/engine/gstengine.h

@@ -185,9 +185,6 @@ class GstEngine : public Engine::Base, public GstBufferConsumer {
   int equalizer_preamp_;
   QList<int> equalizer_gains_;
 
-  mutable bool can_decode_success_;
-  mutable bool can_decode_last_;
-
   // Hack to stop seeks happening too often
   QTimer *seek_timer_;
   bool waiting_to_seek_;