[at-spi2-core/gnome-3-20] atspi_accessible_clear_cache: don't crash if we have no children

[Mike Gorse <mgorse src gnome org>]

commit c565ece411b770856d5ae11eff1929a22133367b
Author: Mike Gorse <mgorse suse com>
Date:   Tue May 31 14:44:17 2016 -0500

    atspi_accessible_clear_cache: don't crash if we have no children
    
    If an accessible is disposed, then its list of children may be NULL.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=767075

 atspi/atspi-accessible.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/atspi/atspi-accessible.c b/atspi/atspi-accessible.c
index ceaedb5..4547ef7 100644
--- a/atspi/atspi-accessible.c
+++ b/atspi/atspi-accessible.c
@@ -1634,8 +1634,9 @@ atspi_accessible_clear_cache (AtspiAccessible *obj)
   if (obj)
   {
     obj->cached_properties = ATSPI_CACHE_NONE;
-    for (i = 0; i < obj->children->len; i++)
-      atspi_accessible_clear_cache (g_ptr_array_index (obj->children, i));
+    if (obj->children)
+      for (i = 0; i < obj->children->len; i++)
+        atspi_accessible_clear_cache (g_ptr_array_index (obj->children, i));
   }
 }