Fix all the code which has duplicate variable declarations

xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.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 2007 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 39 matching lines @@
   parser.Init(bits, e);
   BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   CBC_DataMatrixVersion* version = parser.GetVersion();
   std::unique_ptr<CFX_ByteArray> codewords(parser.ReadCodewords(e));
   BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   CFX_ArrayTemplate<CBC_DataMatrixDataBlock*>* dataBlocks =
       CBC_DataMatrixDataBlock::GetDataBlocks(codewords.get(), version, e);
   BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   int32_t dataBlocksCount = dataBlocks->GetSize();
   int32_t totalBytes = 0;
-  int32_t i, j;
-  for (i = 0; i < dataBlocksCount; i++) {
+  for (int32_t i = 0; i < dataBlocksCount; i++) {
     totalBytes += (*dataBlocks)[i]->GetNumDataCodewords();
   }
   CFX_ByteArray resultBytes;
   resultBytes.SetSize(totalBytes);
-  for (j = 0; j < dataBlocksCount; j++) {
+  for (int32_t j = 0; j < dataBlocksCount; j++) {
     CFX_ByteArray* codewordBytes = (*dataBlocks)[j]->GetCodewords();
     int32_t numDataCodewords = (*dataBlocks)[j]->GetNumDataCodewords();
     CorrectErrors(*codewordBytes, numDataCodewords, e);
     if (e != BCExceptionNO) {
       for (int32_t i = 0; i < dataBlocks->GetSize(); i++) {
         delete (*dataBlocks)[i];
       }
       delete dataBlocks;
       return nullptr;
     }
-    int32_t i;
-    for (i = 0; i < numDataCodewords; i++) {
+    for (int32_t i = 0; i < numDataCodewords; i++) {
       resultBytes[i * dataBlocksCount + j] = (*codewordBytes)[i];
     }
   }
-  for (i = 0; i < (dataBlocks->GetSize()); i++) {
+  for (int32_t i = 0; i < (dataBlocks->GetSize()); i++) {
     delete (*dataBlocks)[i];
   }
   delete dataBlocks;
   CBC_CommonDecoderResult* resultR =
       CBC_DataMatrixDecodedBitStreamParser::Decode(resultBytes, e);
   BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return resultR;
 }
 
 void CBC_DataMatrixDecoder::CorrectErrors(CFX_ByteArray& codewordBytes,
                                           int32_t numDataCodewords,
                                           int32_t& e) {
   int32_t numCodewords = codewordBytes.GetSize();
   CFX_Int32Array codewordsInts;
   codewordsInts.SetSize(numCodewords);
   int32_t i;
   for (i = 0; i < numCodewords; i++) {
     codewordsInts[i] = codewordBytes[i] & 0xFF;
   }
   int32_t numECCodewords = codewordBytes.GetSize() - numDataCodewords;
   m_rsDecoder->Decode(&codewordsInts, numECCodewords, e);
   if (e != BCExceptionNO) {
     e = BCExceptionChecksumException;
     return;
   }
   for (i = 0; i < numDataCodewords; i++) {
     codewordBytes[i] = (uint8_t)codewordsInts[i];
   }
 }