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

core/src/fxge/win32/fx_win32_gdipext.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/fxge/fx_ge.h"
 
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_DESKTOP_
 #include <windows.h>
@@ skipping 1277 matching lines @@
     }
     return res;
   }
 
  public:
   virtual HRESULT STDMETHODCALLTYPE Read(void* Output,
                                          ULONG cb,
                                          ULONG* pcbRead) {
     size_t bytes_left;
     size_t bytes_out;
-    if (pcbRead != NULL) {
+    if (pcbRead) {
       *pcbRead = 0;
     }
     if (m_ReadPos == m_InterStream.GetLength()) {
       return HRESULT_FROM_WIN32(ERROR_END_OF_MEDIA);
     }
     bytes_left = m_InterStream.GetLength() - m_ReadPos;
     bytes_out = FX_MIN(cb, bytes_left);
     FXSYS_memcpy(Output, m_InterStream.GetBuffer() + m_ReadPos, bytes_out);
     m_ReadPos += (int32_t)bytes_out;
-    if (pcbRead != NULL) {
+    if (pcbRead) {
       *pcbRead = (ULONG)bytes_out;
     }
     return S_OK;
   }
   virtual HRESULT STDMETHODCALLTYPE Write(void const* Input,
                                           ULONG cb,
                                           ULONG* pcbWritten) {
     if (cb <= 0) {
-      if (pcbWritten != NULL) {
+      if (pcbWritten) {
         *pcbWritten = 0;
       }
       return S_OK;
     }
     m_InterStream.InsertBlock(m_InterStream.GetLength(), Input, cb);
-    if (pcbWritten != NULL) {
+    if (pcbWritten) {
       *pcbWritten = cb;
     }
     return S_OK;
   }
 
  public:
   virtual HRESULT STDMETHODCALLTYPE SetSize(ULARGE_INTEGER) {
     return E_NOTIMPL;
   }
   virtual HRESULT STDMETHODCALLTYPE CopyTo(IStream*,
@@ skipping 33 matching lines @@
       default:
         return STG_E_INVALIDFUNCTION;
         break;
     }
     new_read_position = start + (long)liDistanceToMove.QuadPart;
     if (new_read_position < 0 ||
         new_read_position > m_InterStream.GetLength()) {
       return STG_E_SEEKERROR;
     }
     m_ReadPos = new_read_position;
-    if (lpNewFilePointer != NULL) {
+    if (lpNewFilePointer) {
       lpNewFilePointer->QuadPart = m_ReadPos;
     }
     return S_OK;
   }
   virtual HRESULT STDMETHODCALLTYPE Stat(STATSTG* pStatstg, DWORD grfStatFlag) {
     if (pStatstg == NULL) {
       return STG_E_INVALIDFUNCTION;
     }
     ZeroMemory(pStatstg, sizeof(STATSTG));
     pStatstg->cbSize.QuadPart = m_InterStream.GetLength();
@@ skipping 119 matching lines @@
                    dest_pitch);
     }
   }
   CFX_DIBitmap* pDIBitmap = _FX_WindowsDIB_LoadFromBuf(
       pInfo->pbmi, pData, pInfo->pbmi->bmiHeader.biBitCount == 32);
   FX_Free(pData);
   FreeDIBitmap(pInfo);
   return pDIBitmap;
 }
 #endif