[subset-plan] Simplify name_languages allocation

src/hb-subset-plan.cc

@@ -843,7 +843,7 @@ hb_subset_plan_create_or_fail (hb_face_t	 *face,
   plan->unicode_to_new_gid_list.init ();
 
   plan->name_ids = hb_set_copy (input->sets.name_ids);
-  plan->name_languages = hb_set_copy (input->sets.name_languages);
+  plan->name_languages = *input->sets.name_languages;
   plan->layout_features = *input->sets.layout_features;
   plan->layout_scripts = *input->sets.layout_scripts;
   plan->glyphs_requested = hb_set_copy (input->sets.glyphs);

src/hb-subset-plan.hh

@@ -50,7 +50,6 @@ struct hb_subset_plan_t
   {
     hb_set_destroy (unicodes);
     hb_set_destroy (name_ids);
-    hb_set_destroy (name_languages);
     hb_set_destroy (glyphs_requested);
     hb_set_destroy (drop_tables);
     hb_set_destroy (no_subset_tables);
@@ -119,7 +118,7 @@ struct hb_subset_plan_t
   hb_set_t *name_ids;
 
   // name_languages we would like to retain
-  hb_set_t *name_languages;
+  hb_set_t name_languages;
 
   //layout features which will be preserved
   hb_set_t layout_features;