fix lealk with cff2::accelerator_templ_t::topDict (#1517)

src/hb-ot-cff2-table.hh

@@ -496,6 +496,7 @@ struct cff2
     void fini ()
     {
       sc.end_processing ();
+      topDict.fini ();
       fontDicts.fini_deep ();
       privateDicts.fini_deep ();
       hb_blob_destroy (blob);