Remove set but unsed variables.

xfa/src/fxbarcode/datamatrix/BC_DataMatrixDecodedBitStreamParser.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 2008 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 65 matching lines @@
           break;
         case 5:
           DecodeEdifactSegment(&bits, result, e);
           BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
           break;
         case 6:
           DecodeBase256Segment(&bits, result, byteSegments, e);
           BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
           break;
         default:
-          NULL;
           e = BCExceptionFormatException;
           return NULL;
       }
       mode = ASCII_ENCODE;
     }
   } while (mode != PAD_ENCODE && bits.Available() > 0);
   if (resultTrailer.GetLength() > 0) {
     result += resultTrailer;
   }
   CBC_CommonDecoderResult* tempCp = new CBC_CommonDecoderResult();
@@ skipping 379 matching lines @@
   BC_FX_ByteString_Append(result, *bytes);
   delete bytes;
 }
 uint8_t CBC_DataMatrixDecodedBitStreamParser::Unrandomize255State(
     int32_t randomizedBase256Codeword,
     int32_t base256CodewordPosition) {
   int32_t pseudoRandomNumber = ((149 * base256CodewordPosition) % 255) + 1;
   int32_t tempVariable = randomizedBase256Codeword - pseudoRandomNumber;
   return (uint8_t)(tempVariable >= 0 ? tempVariable : tempVariable + 256);
 }