From 0938b3df8c25178c8ea0012e1ead1061d03a4e7c Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 26 Jul 2012 15:21:59 +0100
Subject: [PATCH] sna/dri: Add an explanatory assertion

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/sna/sna_dri.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/sna/sna_dri.c b/src/sna/sna_dri.c
index d647c02c..1daf1c47 100644
--- a/src/sna/sna_dri.c
+++ b/src/sna/sna_dri.c
@@ -397,6 +397,7 @@ static void damage(PixmapPtr pixmap, RegionPtr region)
 	struct sna_pixmap *priv;
 
 	priv = sna_pixmap(pixmap);
+	assert(priv != NULL);
 	if (DAMAGE_IS_ALL(priv->gpu_damage))
 		return;