Fix uninitialized variables

src/engine/gstengine.cpp

@@ -83,16 +83,21 @@ GstEngine::GstEngine(TaskManager *task_manager, QObject *parent)
       buffering_task_id_(-1),
       latest_buffer_(nullptr),
       stereo_balancer_enabled_(false),
-      stereo_balance_(0.0f),
+      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),
       timer_id_(-1),
       next_element_id_(0),
       is_fading_out_to_pause_(false),
       has_faded_out_(false),
       scope_chunk_(0),
       have_new_buffer_(false),
+      scope_chunks_(0),
       discovery_finished_cb_id_(-1),
       discovery_discovered_cb_id_(-1)
       {