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

core/src/fpdfdoc/doc_annot.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/fpdfapi/fpdf_pageobj.h"
 #include "core/include/fpdfdoc/fpdf_doc.h"
 #include "third_party/base/nonstd_unique_ptr.h"
 
@@ skipping 286 matching lines @@
     CFX_ByteString style = pBS->GetString("S");
     pDashArray = pBS->GetArray("D");
     style_char = style[1];
     width = pBS->GetNumber("W");
   }
   if (width <= 0) {
     return;
   }
   CPDF_Array* pColor = m_pAnnotDict->GetArray("C");
   FX_DWORD argb = 0xff000000;
-  if (pColor != NULL) {
+  if (pColor) {
     int R = (int32_t)(pColor->GetNumber(0) * 255);
     int G = (int32_t)(pColor->GetNumber(1) * 255);
     int B = (int32_t)(pColor->GetNumber(2) * 255);
     argb = ArgbEncode(0xff, R, G, B);
   }
   CPDF_GraphStateData graph_state;
   graph_state.m_LineWidth = width;
   if (style_char == 'D') {
     if (pDashArray) {
       FX_DWORD dash_count = pDashArray->GetCount();
@@ skipping 20 matching lines @@
   CPDF_PathData path;
   width /= 2;
   path.AppendRect(rect.left + width, rect.bottom + width, rect.right - width,
                   rect.top - width);
   int fill_type = 0;
   if (pOptions && (pOptions->m_Flags & RENDER_NOPATHSMOOTH)) {
     fill_type |= FXFILL_NOPATHSMOOTH;
   }
   pDevice->DrawPath(&path, pUser2Device, &graph_state, argb, argb, fill_type);
 }