drm/virtio: use drm_crtc_send_vblank_event()

Replace the legacy drm_send_vblank_event() with the new helper function.
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1465224105-21485-6-git-send-email-gustavo@padovan.org

drivers/gpu/drm/virtio/virtgpu_display.c

@@ -156,7 +156,7 @@ static int virtio_gpu_page_flip(struct drm_crtc *crtc,
 
 	if (event) {
 		spin_lock_irqsave(&crtc->dev->event_lock, irqflags);
-		drm_send_vblank_event(crtc->dev, -1, event);
+		drm_crtc_send_vblank_event(crtc, event);
 		spin_unlock_irqrestore(&crtc->dev->event_lock, irqflags);
 	}