drm/nouveau: Fix pageflip event

Assign correct event when initializing nouveau_page_flip_state.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index c42d84e..764c15d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -290,7 +290,7 @@
 
 	/* Initialize a page flip struct */
 	*s = (struct nouveau_page_flip_state)
-		{ { }, s->event, nouveau_crtc(crtc)->index,
+		{ { }, event, nouveau_crtc(crtc)->index,
 		  fb->bits_per_pixel, fb->pitch, crtc->x, crtc->y,
 		  new_bo->bo.offset };