Linux: fix jump jump based on uninitialised value.

third_party/harfbuzz/src/harfbuzz-shaper.cpp

 /*
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This is part of HarfBuzz, an OpenType Layout engine 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 415 matching lines @@
 // set the glyph attributes heuristically. Assumes a 1 to 1 relationship between chars and glyphs
 // and no reordering.
 // also computes logClusters heuristically
 void HB_HeuristicSetGlyphAttributes(HB_ShaperItem *item)
 {
     const HB_UChar16 *uc = item->string + item->item.pos;
     hb_uint32 length = item->item.length;
 
     // ### zeroWidth and justification are missing here!!!!!
 
-    assert(item->num_glyphs <= length);
+    assert(length <= item->num_glyphs);
 
 //     qDebug("QScriptEngine::heuristicSetGlyphAttributes, num_glyphs=%d", item->num_glyphs);
     HB_GlyphAttributes *attributes = item->attributes;
     unsigned short *logClusters = item->log_clusters;
 
     hb_uint32 glyph_pos = 0;
     hb_uint32 i;
     for (i = 0; i < length; i++) {
         if (HB_IsHighSurrogate(uc[i]) && i < length - 1
             && HB_IsLowSurrogate(uc[i + 1])) {
             logClusters[i] = glyph_pos;
             logClusters[++i] = glyph_pos;
         } else {
             logClusters[i] = glyph_pos;
         }
         ++glyph_pos;
     }
-    assert(glyph_pos == item->num_glyphs);
 
     // first char in a run is never (treated as) a mark
     int cStart = 0;
     const bool symbolFont = item->face->isSymbolFont;
     attributes[0].mark = false;
     attributes[0].clusterStart = true;
     attributes[0].dontPrint = (!symbolFont && uc[0] == 0x00ad) || HB_IsControlChar(uc[0]);
 
     int pos = 0;
     HB_CharCategory lastCat;
@@ skipping 838 matching lines @@
     if (shaper_item->num_glyphs < shaper_item->item.length) {
         shaper_item->num_glyphs = shaper_item->item.length;
         return false;
     }
     assert(shaper_item->item.script < HB_ScriptCount);
     result = HB_ScriptEngines[shaper_item->item.script].shape(shaper_item);
     shaper_item->glyphIndicesPresent = false;
     return result;
 }