[unicode] Make _get_parent() return _nil object instead of NULL
diff --git a/test/test-unicode.c b/test/test-unicode.c
index 96d6806..cc95a9f 100644
--- a/test/test-unicode.c
+++ b/test/test-unicode.c
@@ -67,7 +67,7 @@
 {
   data_t *data = (data_t *) user_data;
 
-  g_assert (hb_unicode_funcs_get_parent (ufuncs) == NULL);
+  g_assert (hb_unicode_funcs_get_parent (ufuncs) != NULL);
   g_assert (data->value == MAGIC0);
   g_assert (data->freed == FALSE);