Valgrind reports this leak in the settings daemon:

==31999== 63389 (4188 direct, 59201 indirect) bytes in 12 blocks are definitely
lost in loss record 136 of 140
==31999==    at 0x1B909BE1: calloc (vg_replace_malloc.c:175)
==31999==    by 0x1C36B6B3: g_malloc0 (gmem.c:154)
==31999==    by 0x1B9BCF47: gst_xml_registry_load (gstlibxmlregistry.c:856)
==31999==    by 0x1B9B2E3E: gst_registry_load (gstregistry.c:125)
==31999==    by 0x1B9B3A10: _registry_load_func (gstregistrypool.c:110)
==31999==    by 0x1C3629A3: g_list_foreach (glist.c:670)
==31999==    by 0x1B9B3A42: gst_registry_pool_load_all (gstregistrypool.c:125)
==31999==    by 0x1B974648: init_post (gst.c:638)
==31999==    by 0x1B97499C: gst_init_check_with_popt_table (gst.c:345)
==31999==    by 0x1B9749D8: gst_init_with_popt_table (gst.c:290)
==31999==    by 0x1B974A1F: gst_init (gst.c:269)
==31999==    by 0x8065211: acme_volume_gstreamer_class_intern_init
(acme-volume-gstreamer.c:327)
==31999==    by 0x1C32BE50: g_type_class_ref (gtype.c:1908)
==31999==    by 0x1C314468: g_object_newv (gobject.c:858)
==31999==    by 0x1C31485C: g_object_new_valist (gobject.c:985)
==31999==    by 0x1C3149D1: g_object_new (gobject.c:823)
==31999==    by 0x80649EB: acme_volume_new (acme-volume.c:104)
==31999==    by 0x8056FA2: gnome_settings_multimedia_keys_load
(gnome-settings-multimedia-keys.c:941)
==31999==    by 0x8054F8D: gnome_settings_daemon_new (gnome-settings-daemon.c:336)
==31999==    by 0x8053D84: main (factory.c:40)