Get rid of most instance of 'foo == NULL'

fpdfsdk/src/fsdk_baseannot.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 "core/include/fxcrt/fx_ext.h"
 #include "fpdfsdk/include/fsdk_baseannot.h"
 #include "fpdfsdk/include/fsdk_define.h"
 #include "fpdfsdk/include/fsdk_mgr.h"
@@ skipping 548 matching lines @@
   m_pAnnot->DrawAppearance(m_pPageView->GetPDFPage(), pDevice, pUser2Device,
                            mode, pOptions);
 }
 
 FX_BOOL CPDFSDK_BAAnnot::IsAppearanceValid() {
   return m_pAnnot->GetAnnotDict()->GetDict("AP") != NULL;
 }
 
 FX_BOOL CPDFSDK_BAAnnot::IsAppearanceValid(CPDF_Annot::AppearanceMode mode) {
   CPDF_Dictionary* pAP = m_pAnnot->GetAnnotDict()->GetDict("AP");
-  if (pAP == NULL)
+  if (!pAP)
     return FALSE;
 
   // Choose the right sub-ap
   const FX_CHAR* ap_entry = "N";
   if (mode == CPDF_Annot::Down)
     ap_entry = "D";
   else if (mode == CPDF_Annot::Rollover)
     ap_entry = "R";
   if (!pAP->KeyExist(ap_entry))
     ap_entry = "N";
 
   // Get the AP stream or subdirectory
   CPDF_Object* psub = pAP->GetElementValue(ap_entry);
-  if (psub == NULL)
-    return FALSE;
-
-  return TRUE;
+  return !!psub;
 }
 
 void CPDFSDK_BAAnnot::DrawBorder(CFX_RenderDevice* pDevice,
                                  const CFX_Matrix* pUser2Device,
                                  const CPDF_RenderOptions* pOptions) {
   m_pAnnot->DrawBorder(pDevice, pUser2Device, pOptions);
 }
 
 void CPDFSDK_BAAnnot::ClearCachedAP() {
   m_pAnnot->ClearCachedAP();
@@ skipping 367 matching lines @@
 
 UnderlyingPageType* CPDFSDK_Annot::GetUnderlyingPage() {
   return GetPDFPage();
 }
 
 CPDF_Page* CPDFSDK_Annot::GetPDFPage() {
   if (m_pPageView)
     return m_pPageView->GetPDFPage();
   return NULL;
 }