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

core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.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 <limits.h>
 
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_page.h"
@@ skipping 411 matching lines @@
   pFontDict->SetAtReference("FontDescriptor", this, pFontDesc);
   hFont = SelectObject(hDC, hFont);
   DeleteObject(hFont);
   DeleteDC(hDC);
   return LoadFont(pBaseDict);
 }
 #endif
 
 #if (_FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_)
 uint32_t FX_GetLangHashCode(const FX_CHAR* pStr) {
-  FXSYS_assert(pStr != NULL);
+  FXSYS_assert(pStr);
   int32_t iLength = FXSYS_strlen(pStr);
   const FX_CHAR* pStrEnd = pStr + iLength;
   uint32_t uHashCode = 0;
   while (pStr < pStrEnd) {
     uHashCode = 31 * uHashCode + tolower(*pStr++);
   }
   return uHashCode;
 }
 struct FX_LANG2CS {
   FX_DWORD uLang;
@@ skipping 698 matching lines @@
 void FPDFAPI_FlatPageAttr(CPDF_Dictionary* pPageDict,
                           const CFX_ByteStringC& name) {
   if (pPageDict->KeyExist(name)) {
     return;
   }
   CPDF_Object* pObj = FPDFAPI_GetPageAttr(pPageDict, name);
   if (pObj) {
     pPageDict->SetAt(name, pObj->Clone());
   }
 }