Get rid of most instance of 'foo == NULL'

core/src/fpdfapi/fpdf_font/ttgsubtable.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "ttgsubtable.h"
 
 #include "core/include/fxge/fx_freetype.h"
 #include "core/include/fxge/fx_ge.h"
@@ skipping 29 matching lines @@
       buf[mid].value = value;
       return;
     }
   }
   m_Buffer.InsertBlock(low * sizeof(_IntPair), &pair, sizeof(_IntPair));
 }
 FX_BOOL CFX_GlyphMap::Lookup(int key, int& value) {
   void* pResult = FXSYS_bsearch(&key, m_Buffer.GetBuffer(),
                                 m_Buffer.GetSize() / sizeof(_IntPair),
                                 sizeof(_IntPair), _CompareInt);
-  if (pResult == NULL) {
+  if (!pResult) {
     return FALSE;
   }
   value = ((FX_DWORD*)pResult)[1];
   return TRUE;
 }
 bool CFX_CTTGSUBTable::LoadGSUBTable(FT_Bytes gsub) {
   header.Version = gsub[0] << 24 | gsub[1] << 16 | gsub[2] << 8 | gsub[3];
   if (header.Version != 0x00010000) {
     return false;
   }
@@ skipping 90 matching lines @@
         }
         break;
       }
     }
   }
   return false;
 }
 int CFX_CTTGSUBTable::GetCoverageIndex(struct TCoverageFormatBase* Coverage,
                                        uint32_t g) {
   int i = 0;
-  if (Coverage == NULL) {
+  if (!Coverage) {
     return -1;
   }
   switch (Coverage->CoverageFormat) {
     case 1: {
       TCoverageFormat1* c1 = (TCoverageFormat1*)Coverage;
       for (i = 0; i < c1->GlyphCount; i++) {
         if ((uint32_t)c1->GlyphArray[i] == g) {
           return i;
         }
       }
@@ skipping 232 matching lines @@
       FXFT_Load_Sfnt_Table(pFont->GetFace(), FT_MAKE_TAG('G', 'S', 'U', 'B'), 0,
                            pFont->GetSubData(), NULL);
   if (!error && pFont->GetSubData()) {
     nonstd::unique_ptr<CFX_GSUBTable> pGsubTable(new CFX_GSUBTable);
     if (pGsubTable->m_GsubImp.LoadGSUBTable((FT_Bytes)pFont->GetSubData())) {
       return pGsubTable.release();
     }
   }
   return NULL;
 }