Remove NULL in xfa/

xfa/fwl/basewidget/fwl_checkboximp.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/fwl/basewidget/fwl_checkboximp.h"
 
 #include <algorithm>
 
@@ skipping 354 matching lines @@
 }
 void CFWL_CheckBoxImp::NextStates() {
   uint32_t dwFirststate = m_pProperties->m_dwStates;
   if (m_pProperties->m_dwStyleExes & FWL_STYLEEXT_CKB_RadioButton) {
     if ((m_pProperties->m_dwStates & FWL_STATE_CKB_CheckMask) ==
         FWL_STATE_CKB_Unchecked) {
       CFWL_WidgetMgr* pWidgetMgr = CFWL_WidgetMgr::GetInstance();
       if (!pWidgetMgr->IsFormDisabled()) {
         CFX_ArrayTemplate<IFWL_Widget*> radioarr;
         pWidgetMgr->GetSameGroupRadioButton(m_pInterface, radioarr);
-        IFWL_CheckBox* pCheckBox = NULL;
+        IFWL_CheckBox* pCheckBox = nullptr;
         int32_t iCount = radioarr.GetSize();
         for (int32_t i = 0; i < iCount; i++) {
           pCheckBox = static_cast<IFWL_CheckBox*>(radioarr[i]);
           if (pCheckBox != m_pInterface &&
               pCheckBox->GetStates() & FWL_STATE_CKB_Checked) {
             pCheckBox->SetCheckState(0);
             CFX_RectF rt;
             pCheckBox->GetWidgetRect(rt);
             rt.left = rt.top = 0;
             m_pWidgetMgr->RepaintWidget(pCheckBox, &rt);
@@ skipping 177 matching lines @@
 void CFWL_CheckBoxImpDelegate::OnKeyDown(CFWL_MsgKey* pMsg) {
   if (pMsg->m_dwKeyCode == FWL_VKEY_Tab) {
     m_pOwner->DispatchKeyEvent(pMsg);
     return;
   }
   if (pMsg->m_dwKeyCode == FWL_VKEY_Return ||
       pMsg->m_dwKeyCode == FWL_VKEY_Space) {
     m_pOwner->NextStates();
   }
 }