[java-atk-wrapper] Make jaw_object_get_parent return null when getAccessibleParent returns null

[Samuel Thibault <sthibaul src gnome org>]

commit 35f8681e10685850d72a9a9563759ed0d6569e29
Author: Samuel Thibault <samuel thibault ens-lyon org>
Date:   Sun Jun 30 21:44:44 2019 +0200

    Make jaw_object_get_parent return null when getAccessibleParent returns null
    
    Otherwise some accessibility tools get confused

 jni/src/jawobject.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/jni/src/jawobject.c b/jni/src/jawobject.c
index 5806a00..3ced9a4 100644
--- a/jni/src/jawobject.c
+++ b/jni/src/jawobject.c
@@ -220,9 +220,8 @@ jaw_object_get_parent(AtkObject *atk_obj)
       return parent_obj;
   }
 
-  // FIXME: Should we rather return null?
-  g_warning("didn't find parent, returning root");
-  return ATK_OBJECT(atk_get_root());
+  g_warning("didn't find parent, returning null");
+  return NULL;
 }
 
 static void