message: Eventually release display link
diff: @@ -52,6 +52,7 @@ using namespace visionaray;
  - (BOOL)acceptsFirstResponder;
  - (BOOL)acceptsMouseMovedEvents;
  - (void)drawRect: (NSRect)bounds;
  +- (void)dealloc;
  - (void)render;
  - (void)resize:(NSRect)bounds;
  @@ -273,6 +274,13 @@ static CVReturn display_link_callback(
  [self render];
  }
  +- (void)dealloc
  +{
  + CVDisplayLinkRelease(display_link);
  +
  + [super dealloc];
  +}
  +
  - (void)render
  {
  [gl_context makeCurrentContext];
  