[get-alternates] Minor simplify

src/hb-ot-layout.cc

@@ -2322,11 +2322,6 @@ struct hb_get_glyph_alternates_dispatch_t :
   static return_t default_return_value () { return 0; }
   bool stop_sublookup_iteration (return_t r) const { return r; }
 
-  hb_face_t *face;
-
-  hb_get_glyph_alternates_dispatch_t (hb_face_t *face) :
-					face (face) {}
-
   private:
   template <typename T, typename ...Ts> auto
   _dispatch (const T &obj, hb_priority<1>, Ts&&... ds) HB_AUTO_RETURN
@@ -2365,7 +2360,7 @@ hb_ot_layout_lookup_get_glyph_alternates (hb_face_t      *face,
 					  unsigned       *alternate_count  /* IN/OUT.  May be NULL. */,
 					  hb_codepoint_t *alternate_glyphs /* OUT.     May be NULL. */)
 {
-  hb_get_glyph_alternates_dispatch_t c (face);
+  hb_get_glyph_alternates_dispatch_t c;
   const OT::SubstLookup &lookup = face->table.GSUB->table->get_lookup (lookup_index);
   auto ret = lookup.dispatch (&c, glyph, start_offset, alternate_count, alternate_glyphs);
   if (!ret && alternate_count) *alternate_count = 0;