Remove NULL in xfa/

xfa/fwl/basewidget/fwl_pushbuttonimp.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_pushbuttonimp.h"
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/basewidget/ifwl_pushbutton.h"
@@ skipping 49 matching lines @@
 
 FWL_Error CFWL_PushButtonImp::Finalize() {
   delete m_pDelegate;
   m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_Error CFWL_PushButtonImp::GetWidgetRect(CFX_RectF& rect,
                                             FX_BOOL bAutoSize) {
   if (bAutoSize) {
     rect.Set(0, 0, 0, 0);
-    if (m_pProperties->m_pThemeProvider == NULL) {
+    if (!m_pProperties->m_pThemeProvider) {
       m_pProperties->m_pThemeProvider = GetAvailableTheme();
     }
     CFX_WideString wsCaption;
     IFWL_PushButtonDP* pData =
         static_cast<IFWL_PushButtonDP*>(m_pProperties->m_pDataProvider);
     if (pData) {
       pData->GetCaption(m_pInterface, wsCaption);
     }
     int32_t iLen = wsCaption.GetLength();
     if (iLen > 0) {
@@ skipping 34 matching lines @@
   return FWL_Error::Succeeded;
 }
 FWL_Error CFWL_PushButtonImp::DrawWidget(CFX_Graphics* pGraphics,
                                          const CFX_Matrix* pMatrix) {
   if (!pGraphics)
     return FWL_Error::Indefinite;
   if (!m_pProperties->m_pThemeProvider)
     return FWL_Error::Indefinite;
   IFWL_PushButtonDP* pData =
       static_cast<IFWL_PushButtonDP*>(m_pProperties->m_pDataProvider);
-  CFX_DIBitmap* pPicture = NULL;
+  CFX_DIBitmap* pPicture = nullptr;
   IFWL_ThemeProvider* pTheme = m_pProperties->m_pThemeProvider;
   if (HasBorder()) {
     DrawBorder(pGraphics, CFWL_Part::Border, m_pProperties->m_pThemeProvider,
                pMatrix);
   }
   if (HasEdge()) {
     DrawEdge(pGraphics, CFWL_Part::Edge, m_pProperties->m_pThemeProvider,
              pMatrix);
   }
   DrawBkground(pGraphics, m_pProperties->m_pThemeProvider, pMatrix);
@@ skipping 419 matching lines @@
     CFWL_EvtClick wmClick;
     wmClick.m_pSrcTarget = m_pOwner->m_pInterface;
     m_pOwner->DispatchEvent(&wmClick);
     return;
   }
   if (pMsg->m_dwKeyCode != FWL_VKEY_Tab) {
     return;
   }
   m_pOwner->DispatchKeyEvent(pMsg);
 }