Remove NULL in xfa/

xfa/fxfa/app/xfa_ffbarcode.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 "xfa/fxfa/app/xfa_ffbarcode.h"
 
 #include "core/fxcrt/include/fx_ext.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
@@ skipping 93 matching lines @@
     int32_t iMid = (iStart + iEnd) / 2;
     XFA_LPCBARCODETYPEENUMINFO pInfo = g_XFABarCodeTypeEnumData + iMid;
     if (uHash == pInfo->uHash) {
       return pInfo;
     } else if (uHash < pInfo->uHash) {
       iEnd = iMid - 1;
     } else {
       iStart = iMid + 1;
     }
   } while (iStart <= iEnd);
-  return NULL;
+  return nullptr;
 }
 
 }  // namespace.
 
 CXFA_FFBarcode::CXFA_FFBarcode(CXFA_FFPageView* pPageView,
                                CXFA_WidgetAcc* pDataAcc)
     : CXFA_FFTextEdit(pPageView, pDataAcc) {}
 CXFA_FFBarcode::~CXFA_FFBarcode() {}
 FX_BOOL CXFA_FFBarcode::LoadWidget() {
   CFWL_Barcode* pFWLBarcode = CFWL_Barcode::Create();
@@ skipping 105 matching lines @@
 }
 FX_BOOL CXFA_FFBarcode::OnRButtonDown(uint32_t dwFlags,
                                       FX_FLOAT fx,
                                       FX_FLOAT fy) {
   CFWL_Barcode* pBarCodeWidget = (CFWL_Barcode*)m_pNormalWidget;
   if (!pBarCodeWidget || pBarCodeWidget->IsProtectedType()) {
     return FALSE;
   }
   return CXFA_FFTextEdit::OnRButtonDown(dwFlags, fx, fy);
 }