Update harfbuzz-ng to 0.9.27

third_party/harfbuzz-ng/src/hb-buffer-serialize.cc

 /*
  * Copyright © 2012,2013  Google, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this
  * software and its documentation for any purpose, provided that the
  * above copyright notice and the following two paragraphs appear in
  * all copies of this software.
@@ skipping 186 matching lines @@
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "=%u", info[i].cluster));
     }
 
     if (!(flags & HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS))
     {
       if (pos[i].x_offset || pos[i].y_offset)
         p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "@%d,%d", pos[i].x_offset, pos[i].y_offset));
 
       *p++ = '+';
       p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), "%d", pos[i].x_advance));
-      if (pos->y_advance)
+      if (pos[i].y_advance)
         p += MAX (0, snprintf (p, ARRAY_LENGTH (b) - (p - b), ",%d", pos[i].y_advance));
     }
 
     unsigned int l = p - b;
     if (buf_size > l)
     {
       memcpy (buf, b, l);
       buf += l;
       buf_size -= l;
       *buf_consumed += l;
@@ skipping 172 matching lines @@
       return _hb_buffer_deserialize_glyphs_json (buffer,
                                                  buf, buf_len, end_ptr,
                                                  font);
 
     default:
     case HB_BUFFER_SERIALIZE_FORMAT_INVALID:
       return false;
 
   }
 }