Remove foo != NULL checks in xfa/src/fxbarcode.

xfa/src/fxbarcode/pdf417/BC_PDF417.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
 // Original code is licensed as follows:
 /*
  * Copyright 2006 Jeremias Maerki in part, and ZXing Authors in part
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 534 matching lines @@
     int32_t rows =
         calculateNumberOfRows(sourceCodeWords, errorCorrectionCodeWords, cols);
     if (rows < m_minRows) {
       break;
     }
     if (rows > m_maxRows) {
       continue;
     }
     FX_FLOAT newRatio =
         ((17 * cols + 69) * DEFAULT_MODULE_WIDTH) / (rows * HEIGHT);
-    if (dimension != NULL &&
+    if (dimension &&
         fabsf(newRatio - PREFERRED_RATIO) > fabsf(ratio - PREFERRED_RATIO)) {
       continue;
     }
     ratio = newRatio;
     if (dimension) {
       delete dimension;
     }
     dimension = new CFX_Int32Array;
     dimension->Add(cols);
     dimension->Add(rows);
@@ skipping 10 matching lines @@
       dimension->Add(m_minCols);
       dimension->Add(rows);
     }
   }
   if (dimension == NULL) {
     e = BCExceptionUnableToFitMessageInColumns;
     return NULL;
   }
   return dimension;
 }