fdo#57055: Re-enable call to librdf_free_world

cf. <https://bugs.freedesktop.org/show_bug.cgi?id=57055#c1>

Change-Id: Ibcd55720bbd17b72a5cd0cc9fc6417195fbcdfd1

unoxml/source/rdf/librdf_repository.cxx

@@ -127,13 +127,7 @@ bool isInternalContext(librdf_node *i_pNode) throw ()
 //       so they need to be wrapped to be usable with boost::shared_ptr.
 static void safe_librdf_free_world(librdf_world *const world)
 {
-#if 1
-    (void)world; // leak it
-#else
-    // disable this for now: it calls xmlCleanupParser, which now aborts
-    // (see desktop/source/app/main.c)
     if (world) { librdf_free_world(world); }
-#endif
 }
 static void safe_librdf_free_model(librdf_model *const model)
 {