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

core/src/fxge/win32/fx_win32_dwrite.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 <dwrite.h>
@@ skipping 47 matching lines @@
   virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid,
                                                    void** ppvObject);
   virtual ULONG STDMETHODCALLTYPE AddRef();
   virtual ULONG STDMETHODCALLTYPE Release();
   virtual HRESULT STDMETHODCALLTYPE
   CreateStreamFromKey(void const* fontFileReferenceKey,
                       UINT32 fontFileReferenceKeySize,
                       OUT IDWriteFontFileStream** fontFileStream);
 
   static IDWriteFontFileLoader* GetLoader() {
-    if (instance_ == NULL) {
+    if (!instance_) {
       instance_ = new CDwFontFileLoader();
     }
     return instance_;
   }
   static bool IsLoaderInitialized() { return instance_ != NULL; }
 
  private:
   CDwFontFileLoader();
   ULONG refCount_;
   static IDWriteFontFileLoader* instance_;
@@ skipping 130 matching lines @@
                                     CFX_Matrix* pMatrix,
                                     void* font,
                                     FX_FLOAT font_size,
                                     FX_ARGB text_color,
                                     int glyph_count,
                                     unsigned short* glyph_indices,
                                     FX_FLOAT baselineOriginX,
                                     FX_FLOAT baselineOriginY,
                                     void* glyph_offsets,
                                     FX_FLOAT* glyph_advances) {
-  if (renderTarget == NULL) {
+  if (!renderTarget) {
     return TRUE;
   }
   CDwGdiTextRenderer* pTextRenderer = (CDwGdiTextRenderer*)renderTarget;
   DWRITE_MATRIX transform;
   DWRITE_GLYPH_RUN glyphRun;
   HRESULT hr = S_OK;
   if (pMatrix) {
     transform.m11 = pMatrix->a;
     transform.m12 = pMatrix->b;
     transform.m21 = pMatrix->c;
@@ skipping 171 matching lines @@
                                     textColor);
   if (FAILED(hr)) {
     return hr;
   }
   pBitmap_->CompositeBitmap(text_bbox.left, text_bbox.top, text_bbox.Width(),
                             text_bbox.Height(), &dib, text_bbox.left,
                             text_bbox.top, FXDIB_BLEND_NORMAL, pClipRgn);
   return hr;
 }
 #endif