[buffer] HB_NODISCARD output_info()

src/hb-buffer.hh

@@ -242,7 +242,7 @@ struct hb_buffer_t
     out_len++;
     return out_info[out_len - 1];
   }
-  bool output_info (const hb_glyph_info_t &glyph_info)
+  HB_NODISCARD bool output_info (const hb_glyph_info_t &glyph_info)
   {
     if (unlikely (!make_room_for (0, 1))) return false;
 

src/hb-ot-shape-complex-syllabic.cc

@@ -88,7 +88,7 @@ hb_syllabic_insert_dotted_circles (hb_font_t *font,
 	  buffer->next_glyph ();
       }
 
-      buffer->output_info (ginfo);
+      (void) buffer->output_info (ginfo);
     }
     else
       buffer->next_glyph ();

src/hb-ot-shape.cc

@@ -534,7 +534,7 @@ hb_insert_dotted_circle (hb_buffer_t *buffer, hb_font_t *font)
   hb_glyph_info_t info = dottedcircle;
   info.cluster = buffer->cur().cluster;
   info.mask = buffer->cur().mask;
-  buffer->output_info (info);
+  (void) buffer->output_info (info);
   buffer->swap_buffers ();
 }