[at-spi2-atk] Only query a relation set if it is non-NULL

[Mike Gorse <mgorse src gnome org>]

commit c0a05e32cc6569d245747d192352ce2be3b4cddd
Author: Mike Gorse <mgorse novell com>
Date:   Fri Mar 5 14:56:13 2010 -0500

    Only query a relation set if it is non-NULL

 atk-adaptor/adaptors/accessible-adaptor.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/atk-adaptor/adaptors/accessible-adaptor.c b/atk-adaptor/adaptors/accessible-adaptor.c
index dc46850..818fca4 100644
--- a/atk-adaptor/adaptors/accessible-adaptor.c
+++ b/atk-adaptor/adaptors/accessible-adaptor.c
@@ -292,7 +292,9 @@ impl_GetRelationSet (DBusConnection * bus,
     {
       goto oom;
     }
-  count = atk_relation_set_get_n_relations (set);
+  count = 0;
+  if (set)
+    count = atk_relation_set_get_n_relations (set);
   for (i = 0; i < count; i++)
     {
       AtkRelation *r = atk_relation_set_get_relation (set, i);