minor changes

panels/viewer.cpp

@@ -263,9 +263,7 @@ void Viewer::seek(long p) {
 		}
 	}
 	reset_all_audio();
-	if (last_playhead != seq->playhead) {
-		audio_scrub = true;
-	}
+	audio_scrub = true;
 	last_playhead = seq->playhead;
 	update_parents(update_fx);
 }

ui/viewerwidget.h

@@ -25,7 +25,7 @@ class ViewerWidget : public QOpenGLWidget, QOpenGLFunctions
 {
 	Q_OBJECT
 public:
-	ViewerWidget(QWidget *parent = 0);
+	ViewerWidget(QWidget *parent = nullptr);
 	~ViewerWidget();
 
 	void delete_function();