Get rid of NULLs in core/

core/fpdfapi/fpdf_page/cpdf_allstates.cpp

 // Copyright 2016 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 "core/fpdfapi/fpdf_page/cpdf_allstates.h"
 
 #include "core/fpdfapi/fpdf_page/pageint.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
@@ skipping 108 matching lines @@
           pParser->GetPageObjectHolder()->SetBackgroundAlphaNeeded(TRUE);
         }
         break;
       }
       case FXBSTR_ID('S', 'M', 'a', 's'):
         if (ToDictionary(pObject)) {
           pGeneralState->m_pSoftMask = pObject;
           FXSYS_memcpy(pGeneralState->m_SMaskMatrix,
                        &pParser->GetCurStates()->m_CTM, sizeof(CFX_Matrix));
         } else {
-          pGeneralState->m_pSoftMask = NULL;
+          pGeneralState->m_pSoftMask = nullptr;
         }
         break;
       case FXBSTR_ID('C', 'A', 0, 0):
         pGeneralState->m_StrokeAlpha = ClipFloat(pObject->GetNumber());
         break;
       case FXBSTR_ID('c', 'a', 0, 0):
         pGeneralState->m_FillAlpha = ClipFloat(pObject->GetNumber());
         break;
       case FXBSTR_ID('O', 'P', 0, 0):
         pGeneralState->m_StrokeOP = pObject->GetInteger();
@@ skipping 36 matching lines @@
       case FXBSTR_ID('A', 'I', 'S', 0):
         pGeneralState->m_AlphaSource = pObject->GetInteger();
         break;
       case FXBSTR_ID('T', 'K', 0, 0):
         pGeneralState->m_TextKnockout = pObject->GetInteger();
         break;
     }
   }
   pGeneralState->m_Matrix = m_CTM;
 }