sna: Fix assertion for checking inactive shadow buffers

We may have an ordinary malloc with no CPU bo attached so check before
dereferencing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index fc44b471..595b834f 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -11766,7 +11766,7 @@ static void sna_accel_inactive(struct sna *sna)
 			sna_damage_destroy(&priv->cpu_damage);
 			list_del(&priv->list);
 
-			assert(!priv->cpu_bo->sync);
+			assert(priv->cpu_bo == NULL || !priv->cpu_bo->sync);
 			sna_pixmap_free_cpu(sna, priv);
 			priv->undamaged = false;