Get rid of NULLs in xfa/

xfa/fwl/theme/cfwl_widgettp.cpp

Index: xfa/fwl/theme/cfwl_widgettp.cpp
diff --git a/xfa/fwl/theme/cfwl_widgettp.cpp b/xfa/fwl/theme/cfwl_widgettp.cpp
index 1b437ebe9bc4315713c9bbf7fadc1641c2f195b2..3704f87a300b74268e4d86b176bdf5afb95d8fec 100644
--- a/xfa/fwl/theme/cfwl_widgettp.cpp
+++ b/xfa/fwl/theme/cfwl_widgettp.cpp
@@ -149,7 +149,7 @@ void* CFWL_WidgetTP::GetCapacity(CFWL_ThemePart* pThemePart,
       m_rtMargin.Set(0, 0, 0, 0);
       return &m_rtMargin;
     }
-    default: { return NULL; }
+    default: { return nullptr; }
   }
   return &m_fValue;
 }
@@ -664,17 +664,17 @@ void CFWL_WidgetTP::DrawArrowBtn(CFX_Graphics* pGraphics,
       CFWL_ArrowData::GetInstance()->m_pColorData;
   DrawArrow(pGraphics, pRect, eDict, pColorData->clrSign[eState - 1], pMatrix);
 }
-CFWL_ArrowData::CFWL_ArrowData() : m_pColorData(NULL) {
+CFWL_ArrowData::CFWL_ArrowData() : m_pColorData(nullptr) {
   SetColorData(0);
 }
 CFWL_FontData::CFWL_FontData()
     : m_dwStyles(0),
       m_dwCodePage(0),
       m_pFont(0),
-      m_pFontMgr(NULL)
+      m_pFontMgr(nullptr)
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
       ,
-      m_pFontSource(NULL)
+      m_pFontSource(nullptr)
 #endif
 {
 }
@@ -686,9 +686,8 @@ CFWL_FontData::~CFWL_FontData() {
     m_pFontMgr->Release();
   }
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
-  if (m_pFontSource != NULL) {
+  if (m_pFontSource)
     m_pFontSource->Release();
-  }
 #endif
 }
 FX_BOOL CFWL_FontData::Equal(const CFX_WideStringC& wsFontFamily,
@@ -713,7 +712,7 @@ FX_BOOL CFWL_FontData::LoadFont(const CFX_WideStringC& wsFontFamily,
   }
   m_pFont = IFGAS_Font::LoadFont(wsFontFamily.c_str(), dwFontStyles, dwCodePage,
                                  m_pFontMgr);
-  return m_pFont != NULL;
+  return !!m_pFont;
 }
 
 CFWL_FontManager* CFWL_FontManager::s_FontManager = nullptr;
@@ -755,7 +754,7 @@ uint32_t FWL_GetThemeColor(uint32_t dwThemeID) {
   return 0x0000ffff & dwThemeID;
 }
 
-CFWL_ArrowData* CFWL_ArrowData::m_pInstance = NULL;
+CFWL_ArrowData* CFWL_ArrowData::m_pInstance = nullptr;
 
 CFWL_ArrowData* CFWL_ArrowData::GetInstance() {
   if (!m_pInstance)