[TASK] Fix some compiler warnings

src/audioplayer.cpp

@@ -49,8 +49,6 @@ void AudioPlayer::togglePlayback()
     case QMediaPlayer::PlayingState:
         pauseOrStopPlayback();
         break;
-    default:
-        break;
     }
 }
 

src/audioplayer.h

@@ -19,7 +19,7 @@ class AudioPlayer : public QMediaPlayer {
 
 
 public:
-    explicit AudioPlayer(QObject *parent = 0);
+    explicit AudioPlayer(QObject *parent = nullptr);
     ~AudioPlayer();
 
     bool isPlaying() const { return state() == QMediaPlayer::PlayingState; }

src/mprisbase.h

@@ -20,7 +20,7 @@ class MprisBase : public QDBusAbstractAdaptor
     Q_PROPERTY(bool FullScreen READ FullScreen WRITE setFullScreen)
 
 public:
-    explicit MprisBase(QObject *parent = 0);
+    explicit MprisBase(QObject *parent = nullptr);
 
     bool FullScreen() const { return false; }
     bool CanSetFullscreen() const { return false; }

src/mprisplayer.cpp

@@ -61,7 +61,7 @@ double MprisPlayer::MaximumRate()
 
 double MprisPlayer::Rate()
 {
-    return m_player->playbackRate();
+    return static_cast<double>(m_player->playbackRate());
 }
 
 double MprisPlayer::Volume()

src/settings.h

@@ -8,7 +8,7 @@ class Settings : public QObject {
     Q_OBJECT
 
 public:
-    explicit Settings(QObject *parent = 0);
+    explicit Settings(QObject *parent = nullptr);
     Q_INVOKABLE void setValue(const QString & key, const QVariant & value);
     Q_INVOKABLE QVariant value(const QString &key, const QVariant &defaultValue = QVariant()) const;