drm/qxl: 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/1465224105-21485-4-git-send-email-gustavo@padovan.org

drivers/gpu/drm/qxl/qxl_display.c

@@ -256,7 +256,7 @@ static int qxl_crtc_page_flip(struct drm_crtc *crtc,
 
 	if (event) {
 		spin_lock_irqsave(&dev->event_lock, flags);
-		drm_send_vblank_event(dev, qcrtc->index, event);
+		drm_crtc_send_vblank_event(crtc, event);
 		spin_unlock_irqrestore(&dev->event_lock, flags);
 	}
 	drm_vblank_put(dev, qcrtc->index);