[gegl] Use set_qdata for gegl_object_set_has_forked

[Daniel Sabo <daniels src gnome org>]

commit fdf2e3d15687f2d8f16f386d6d1fcb0fb9e02d66
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Fri Dec 6 23:33:32 2013 -0800

    Use set_qdata for gegl_object_set_has_forked

 gegl/operation/gegl-operations.c |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/gegl/operation/gegl-operations.c b/gegl/operation/gegl-operations.c
index 9490185..f1f7c56 100644
--- a/gegl/operation/gegl-operations.c
+++ b/gegl/operation/gegl-operations.c
@@ -191,15 +191,26 @@ gboolean gegl_can_do_inplace_processing (GeglOperation       *operation,
   return FALSE;
 }
 
+static GQuark
+gegl_has_forked_quark (void)
+{
+  static GQuark the_quark = 0;
+
+  if (G_UNLIKELY (the_quark == 0))
+    the_quark = g_quark_from_static_string ("gegl-object-has-forked");
+
+  return the_quark;
+}
+
 void
 gegl_object_set_has_forked (GObject *object)
 {
-  g_object_set_data (object, "gegl has-forked", (void*)0xf);
+  g_object_set_qdata (object, gegl_has_forked_quark (), (void*)0xf);
 }
 
 
 gboolean
 gegl_object_get_has_forked (GObject *object)
 {
-  return g_object_get_data(object, "gegl has-forked") != NULL;
+  return g_object_get_qdata (object, gegl_has_forked_quark ()) != NULL;
 }