Revert "defaultiface: Fix leak in test"

This reverts commit fd7b2faa64.

This required another patch to be commited first. Will put this
back in bugzilla.

tests/gobject/defaultiface.c

@@ -141,9 +141,8 @@ static void
 test_dynamic_iface (void)
 {
   TestDynamicIfaceClass *dynamic_iface;
-  GTypeModule *module;
 
-  module = test_module_new (module_register);
+  test_module_new (module_register);
 
   /* Not loaded until we call ref for the first time */
   dynamic_iface = g_type_default_interface_peek (TEST_TYPE_DYNAMIC_IFACE);
@@ -180,8 +179,6 @@ test_dynamic_iface (void)
 #if 0
   g_assert (!dynamic_iface_init);
 #endif
-
-  g_object_unref (module);
 }
 
 int