Get rid of NULLs in fpdfsdk/

fpdfsdk/pdfwindow/PWL_Label.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 "fpdfsdk/fxedit/include/fx_edit.h"
 #include "fpdfsdk/pdfwindow/PWL_Label.h"
 #include "fpdfsdk/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/pdfwindow/PWL_Wnd.h"
@@ skipping 69 matching lines @@
 }
 
 void CPWL_Label::DrawThisAppearance(CFX_RenderDevice* pDevice,
                                     CFX_Matrix* pUser2Device) {
   CPWL_Wnd::DrawThisAppearance(pDevice, pUser2Device);
 
   GetClientRect();
 
   CFX_FloatRect rcClip;
   CPVT_WordRange wrRange = m_pEdit->GetVisibleWordRange();
-  CPVT_WordRange* pRange = NULL;
+  CPVT_WordRange* pRange = nullptr;
 
   if (!HasFlag(PES_TEXTOVERFLOW)) {
     rcClip = GetClientRect();
     pRange = &wrRange;
   }
   CFX_SystemHandler* pSysHandler = GetSystemHandler();
   IFX_Edit::DrawEdit(
       pDevice, pUser2Device, m_pEdit,
       CPWL_Utils::PWLColorToFXColor(GetTextColor(), GetTransparency()),
       CPWL_Utils::PWLColorToFXColor(GetTextStrokeColor(), GetTransparency()),
-      rcClip, CFX_FloatPoint(0.0f, 0.0f), pRange, pSysHandler, NULL);
+      rcClip, CFX_FloatPoint(0.0f, 0.0f), pRange, pSysHandler, nullptr);
 }
 
 void CPWL_Label::SetHorzScale(int32_t nHorzScale) {
   m_pEdit->SetHorzScale(nHorzScale);
 }
 
 void CPWL_Label::SetCharSpace(FX_FLOAT fCharSpace) {
   m_pEdit->SetCharSpace(fCharSpace);
 }
 
@@ skipping 22 matching lines @@
   return m_pEdit->GetText();
 }
 
 void CPWL_Label::SetLimitChar(int32_t nLimitChar) {
   m_pEdit->SetLimitChar(nLimitChar);
 }
 
 int32_t CPWL_Label::GetTotalWords() {
   return m_pEdit->GetTotalWords();
 }