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

core/src/fpdftext/fpdf_text_int.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 <cctype>
 #include <cwctype>
 #include <algorithm>
 
@@ skipping 2446 matching lines @@
         char_right >= L'0' && char_right <= L'9') {
       return FALSE;
     }
   }
   return TRUE;
 }
 FX_BOOL CPDF_TextPageFind::ExtractSubString(CFX_WideString& rString,
                                             const FX_WCHAR* lpszFullString,
                                             int iSubString,
                                             FX_WCHAR chSep) {
-  if (lpszFullString == NULL) {
+  if (!lpszFullString) {
     return FALSE;
   }
   while (iSubString--) {
     lpszFullString = FXSYS_wcschr(lpszFullString, chSep);
-    if (lpszFullString == NULL) {
+    if (!lpszFullString) {
       rString.Empty();
       return FALSE;
     }
     lpszFullString++;
     while (*lpszFullString == chSep) {
       lpszFullString++;
     }
   }
   const FX_WCHAR* lpchEnd = FXSYS_wcschr(lpszFullString, chSep);
-  int nLen = (lpchEnd == NULL) ? (int)FXSYS_wcslen(lpszFullString)
-                               : (int)(lpchEnd - lpszFullString);
+  int nLen = lpchEnd ? (int)(lpchEnd - lpszFullString)
+                     : (int)FXSYS_wcslen(lpszFullString);
   ASSERT(nLen >= 0);
   FXSYS_memcpy(rString.GetBuffer(nLen), lpszFullString,
                nLen * sizeof(FX_WCHAR));
   rString.ReleaseBuffer();
   return TRUE;
 }
 CFX_WideString CPDF_TextPageFind::MakeReverse(const CFX_WideString& str) {
   CFX_WideString str2;
   str2.Empty();
   int nlen = str.GetLength();
@@ skipping 232 matching lines @@
   if (!m_bIsParsed || index < 0 || index >= m_LinkList.GetSize()) {
     return;
   }
   CPDF_LinkExt* link = NULL;
   link = m_LinkList.GetAt(index);
   if (!link) {
     return;
   }
   m_pTextPage->GetRectArray(link->m_Start, link->m_Count, rects);
 }