player/Listener: add "noexcept"

src/Partition.cxx

@@ -118,13 +118,13 @@ Partition::OnQueueSongStarted()
 }
 
 void
-Partition::OnPlayerSync()
+Partition::OnPlayerSync() noexcept
 {
 	EmitGlobalEvent(SYNC_WITH_PLAYER);
 }
 
 void
-Partition::OnPlayerTagModified()
+Partition::OnPlayerTagModified() noexcept
 {
 	EmitGlobalEvent(TAG_MODIFIED);
 }

src/Partition.hxx

@@ -232,8 +232,8 @@ private:
 	void OnQueueSongStarted() override;
 
 	/* virtual methods from class PlayerListener */
-	void OnPlayerSync() override;
-	void OnPlayerTagModified() override;
+	void OnPlayerSync() noexcept override;
+	void OnPlayerTagModified() noexcept override;
 
 	/* virtual methods from class MixerListener */
 	void OnMixerVolumeChanged(Mixer &mixer, int volume) override;

src/player/Listener.hxx

@@ -25,12 +25,12 @@ public:
 	/**
 	 * Must call playlist_sync().
 	 */
-	virtual void OnPlayerSync() = 0;
+	virtual void OnPlayerSync() noexcept = 0;
 
 	/**
 	 * The current song's tag has changed.
 	 */
-	virtual void OnPlayerTagModified() = 0;
+	virtual void OnPlayerTagModified() noexcept = 0;
 };
 
 #endif