[ot-face] Remove a few ensures

src/hb-face.cc

@@ -551,7 +551,6 @@ void
 hb_face_collect_unicodes (hb_face_t *face,
 			  hb_set_t  *out)
 {
-  if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
   face->table.cmap->collect_unicodes (out);
 }
 
@@ -568,7 +567,6 @@ void
 hb_face_collect_variation_selectors (hb_face_t *face,
 				     hb_set_t  *out)
 {
-  if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
   face->table.cmap->collect_variation_selectors (out);
 }
 
@@ -586,7 +584,6 @@ hb_face_collect_variation_unicodes (hb_face_t *face,
 				    hb_codepoint_t variation_selector,
 				    hb_set_t  *out)
 {
-  if (unlikely (!hb_ot_shaper_face_data_ensure (face))) return;
   face->table.cmap->collect_variation_unicodes (variation_selector, out);
 }