drm/shmob: use drm_send_vblank_event() helper

{

	struct drm_pending_vblank_event *event;

	struct drm_device *dev = scrtc->crtc.dev;

	struct timeval vblanktime;

	unsigned long flags;

	spin_lock_irqsave(&dev->event_lock, flags);

	event = scrtc->event;

	scrtc->event = NULL;

	spin_unlock_irqrestore(&dev->event_lock, flags);

	if (event == NULL)

		return;

	event->event.sequence = drm_vblank_count_and_time(dev, 0, &vblanktime);

	event->event.tv_sec = vblanktime.tv_sec;

	event->event.tv_usec = vblanktime.tv_usec;

	spin_lock_irqsave(&dev->event_lock, flags);

	list_add_tail(&event->base.link, &event->base.file_priv->event_list);

	wake_up_interruptible(&event->base.file_priv->event_wait);

	spin_unlock_irqrestore(&dev->event_lock, flags);

	if (event) {

		drm_send_vblank_event(dev, 0, event);

		drm_vblank_put(dev, 0);

	}

	spin_unlock_irqrestore(&dev->event_lock, flags);

}

static int shmob_drm_crtc_page_flip(struct drm_crtc *crtc,

				    struct drm_framebuffer *fb,