Get rid of NULLs in core/

core/fxge/win32/win32_int.h

 // 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
 
 #ifndef CORE_FXGE_WIN32_WIN32_INT_H_
 #define CORE_FXGE_WIN32_WIN32_INT_H_
 
 #include "core/fxge/include/fx_ge.h"
 #include "core/fxge/win32/dwrite_int.h"
 
 struct WINDIB_Open_Args_;
 class CGdiplusExt {
  public:
   CGdiplusExt();
   ~CGdiplusExt();
   void Load();
-  FX_BOOL IsAvailable() { return m_hModule != NULL; }
+  FX_BOOL IsAvailable() { return !!m_hModule; }
   FX_BOOL StretchBitMask(HDC hDC,
                          BOOL bMonoDevice,
                          const CFX_DIBitmap* pBitmap,
                          int dest_left,
                          int dest_top,
                          int dest_width,
                          int dest_height,
                          uint32_t argb,
                          const FX_RECT* pClipRect,
                          int flags);
@@ skipping 151 matching lines @@
 };
 
 class CGdiDisplayDriver : public CGdiDeviceDriver {
  public:
   CGdiDisplayDriver(HDC hDC);
 
  protected:
   FX_BOOL GetDIBits(CFX_DIBitmap* pBitmap,
                     int left,
                     int top,
-                    void* pIccTransform = NULL,
+                    void* pIccTransform = nullptr,
                     FX_BOOL bDEdge = FALSE) override;
   FX_BOOL SetDIBits(const CFX_DIBSource* pBitmap,
                     uint32_t color,
                     const FX_RECT* pSrcRect,
                     int left,
                     int top,
                     int blend_type,
                     int alpha_flag,
                     void* pIccTransform) override;
   FX_BOOL StretchDIBits(const CFX_DIBSource* pBitmap,
@@ skipping 20 matching lines @@
   }
   FX_BOOL UseFoxitStretchEngine(const CFX_DIBSource* pSource,
                                 uint32_t color,
                                 int dest_left,
                                 int dest_top,
                                 int dest_width,
                                 int dest_height,
                                 const FX_RECT* pClipRect,
                                 int render_flags,
                                 int alpha_flag = 0,
-                                void* pIccTransform = NULL,
+                                void* pIccTransform = nullptr,
                                 int blend_type = FXDIB_BLEND_NORMAL);
 };
 
 class CGdiPrinterDriver : public CGdiDeviceDriver {
  public:
   explicit CGdiPrinterDriver(HDC hDC);
   ~CGdiPrinterDriver() override;
 
  protected:
   int GetDeviceCaps(int caps_id) override;
@@ skipping 24 matching lines @@
                       void*& handle,
                       int alpha_flag,
                       void* pIccTransform,
                       int blend_type) override;
 
   const int m_HorzSize;
   const int m_VertSize;
 };
 
 #endif  // CORE_FXGE_WIN32_WIN32_INT_H_