damage: Avoid freeing the NIL error object

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

1 files changed, 3 insertions, 0 deletions

diff --git a/src/cairo-damage.c b/src/cairo-damage.c
index f0a73061c..269f6dfdf 100644
--- a/src/cairo-damage.c
+++ b/src/cairo-damage.c
@@ -69,6 +69,9 @@ _cairo_damage_destroy (cairo_damage_t *damage)
 {
     struct _cairo_damage_chunk *chunk, *next;
 
+    if (damage == (cairo_damage_t *) &__cairo_damage__nil)
+	return;
+
     for (chunk = damage->chunks.next; chunk != NULL; chunk = next) {
 	next = chunk->next;
 	free (chunk);