[gegl] tests/test-serialize: update with API changes

[Øyvind Kolås <ok src gnome org>]

commit e6751da0c56ac37250ca69b5626ba3c162944c58
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue May 2 19:07:47 2017 +0200

    tests/test-serialize: update with API changes

 tests/simple/test-serialize.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/simple/test-serialize.c b/tests/simple/test-serialize.c
index 36bb02f..95a902d 100644
--- a/tests/simple/test-serialize.c
+++ b/tests/simple/test-serialize.c
@@ -123,7 +123,7 @@ test_serialize (void)
     gint res = SUCCESS;
     gchar *serialization = NULL;
     gegl_create_chain (tests[i].argv_chain, start, end,
-                    0.0, 500, &error);
+                    0.0, 500, NULL, &error);
     serialization = gegl_serialize (start, gegl_node_get_producer (end, "input", NULL), "/", 
GEGL_SERIALIZE_TRIM_DEFAULTS);
     if (strcmp (serialization, tests[i].expected_serialization))
     {