Get rid of NULLs in xfa/

xfa/fwl/basewidget/fwl_monthcalendarimp.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_monthcalendarimp.h"
 
 #include <algorithm>
 
@@ skipping 217 matching lines @@
   }
   ClearDateItem();
   ReSetDateItem();
   LayOut();
   return FWL_Error::Succeeded;
 }
 FWL_Error CFWL_MonthCalendarImp::DrawWidget(CFX_Graphics* pGraphics,
                                             const CFX_Matrix* pMatrix) {
   if (!pGraphics)
     return FWL_Error::Indefinite;
-  if (m_pProperties->m_pThemeProvider == NULL) {
+  if (!m_pProperties->m_pThemeProvider)
     m_pProperties->m_pThemeProvider = GetAvailableTheme();
-  }
+
   IFWL_ThemeProvider* pTheme = m_pProperties->m_pThemeProvider;
   if (HasBorder()) {
     DrawBorder(pGraphics, CFWL_Part::Border, pTheme, pMatrix);
   }
   if (HasEdge()) {
     DrawEdge(pGraphics, CFWL_Part::Edge, pTheme, pMatrix);
   }
   DrawBkground(pGraphics, pTheme, pMatrix);
   DrawHeadBK(pGraphics, pTheme, pMatrix);
   DrawLButton(pGraphics, pTheme, pMatrix);
@@ skipping 940 matching lines @@
   if (m_pOwner->m_iHovered > 0) {
     CFX_RectF rtInvalidate;
     rtInvalidate.Set(0, 0, 0, 0);
     m_pOwner->GetDayRect(m_pOwner->m_iHovered, rtInvalidate);
     m_pOwner->m_iHovered = -1;
     if (!rtInvalidate.IsEmpty()) {
       m_pOwner->Repaint(&rtInvalidate);
     }
   }
 }