Get rid of NULLs in fpdfsdk/

fpdfsdk/fpdf_sysfontinfo.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 "public/fpdf_sysfontinfo.h"
 
 #include "core/fxge/include/fx_font.h"
 #include "core/fxge/include/fx_ge.h"
@@ skipping 18 matching lines @@
 
   void* MapFont(int weight,
                 FX_BOOL bItalic,
                 int charset,
                 int pitch_family,
                 const FX_CHAR* family,
                 int& iExact) override {
     if (m_pInfo->MapFont)
       return m_pInfo->MapFont(m_pInfo, weight, bItalic, charset, pitch_family,
                               family, &iExact);
-    return NULL;
+    return nullptr;
   }
 
   void* GetFont(const FX_CHAR* family) override {
     if (m_pInfo->GetFont)
       return m_pInfo->GetFont(m_pInfo, family);
-    return NULL;
+    return nullptr;
   }
 
   uint32_t GetFontData(void* hFont,
                        uint32_t table,
                        uint8_t* buffer,
                        uint32_t size) override {
     if (m_pInfo->GetFontData)
       return m_pInfo->GetFontData(m_pInfo, hFont, table, buffer, size);
     return 0;
   }
 
   FX_BOOL GetFaceName(void* hFont, CFX_ByteString& name) override {
     if (!m_pInfo->GetFaceName)
       return FALSE;
-    uint32_t size = m_pInfo->GetFaceName(m_pInfo, hFont, NULL, 0);
+    uint32_t size = m_pInfo->GetFaceName(m_pInfo, hFont, nullptr, 0);
     if (size == 0)
       return FALSE;
     char* buffer = FX_Alloc(char, size);
     size = m_pInfo->GetFaceName(m_pInfo, hFont, buffer, size);
     name = CFX_ByteString(buffer, size);
     FX_Free(buffer);
     return TRUE;
   }
 
   FX_BOOL GetFontCharset(void* hFont, int& charset) override {
@@ skipping 111 matching lines @@
   pFontInfoExt->GetFaceName = DefaultGetFaceName;
   pFontInfoExt->GetFont = DefaultGetFont;
   pFontInfoExt->GetFontCharset = DefaultGetFontCharset;
   pFontInfoExt->GetFontData = DefaultGetFontData;
   pFontInfoExt->MapFont = DefaultMapFont;
   pFontInfoExt->Release = DefaultRelease;
   pFontInfoExt->version = 1;
   pFontInfoExt->m_pFontInfo = pFontInfo.release();
   return pFontInfoExt;
 }