Get rid of NULLs in xfa/

xfa/fxfa/app/xfa_ffimage.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_ffimage.h"
 
 #include "xfa/fxfa/app/xfa_ffdraw.h"
 #include "xfa/fxfa/include/xfa_ffapp.h"
 #include "xfa/fxfa/include/xfa_ffdoc.h"
 #include "xfa/fxfa/include/xfa_ffpageview.h"
 #include "xfa/fxfa/include/xfa_ffwidget.h"
 
 CXFA_FFImage::CXFA_FFImage(CXFA_FFPageView* pPageView, CXFA_WidgetAcc* pDataAcc)
     : CXFA_FFDraw(pPageView, pDataAcc) {}
 CXFA_FFImage::~CXFA_FFImage() {
   CXFA_FFImage::UnloadWidget();
 }
 FX_BOOL CXFA_FFImage::IsLoaded() {
-  return GetDataAcc()->GetImageImage() != NULL;
+  return !!GetDataAcc()->GetImageImage();
 }
 FX_BOOL CXFA_FFImage::LoadWidget() {
   if (GetDataAcc()->GetImageImage()) {
     return TRUE;
   }
   GetDataAcc()->LoadImageImage();
   return CXFA_FFDraw::LoadWidget();
 }
 void CXFA_FFImage::UnloadWidget() {
-  GetDataAcc()->SetImageImage(NULL);
+  GetDataAcc()->SetImageImage(nullptr);
 }
 void CXFA_FFImage::RenderWidget(CFX_Graphics* pGS,
                                 CFX_Matrix* pMatrix,
                                 uint32_t dwStatus,
                                 int32_t iRotate) {
   if (!IsMatchVisibleStatus(dwStatus)) {
     return;
   }
   CFX_Matrix mtRotate;
   GetRotateMatrix(mtRotate);
@@ skipping 16 matching lines @@
     CXFA_Value value = m_pDataAcc->GetFormValue();
     CXFA_Image imageObj = value.GetImage();
     int32_t iAspect = imageObj.GetAspect();
     int32_t iImageXDpi = 0;
     int32_t iImageYDpi = 0;
     m_pDataAcc->GetImageDpi(iImageXDpi, iImageYDpi);
     XFA_DrawImage(pGS, rtImage, &mtRotate, pDIBitmap, iAspect, iImageXDpi,
                   iImageYDpi, iHorzAlign, iVertAlign);
   }
 }