Fix all the code which has duplicate variable declarations

xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.cpp

Index: xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.cpp
diff --git a/xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.cpp b/xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.cpp
index 4276066444a907e4e8880f985365df15c61cae45..ffa0a4d9d1ddbce820df908ee973d1c76cf77e8a 100644
--- a/xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.cpp
+++ b/xfa/fxbarcode/datamatrix/BC_DataMatrixDecoder.cpp
@@ -57,13 +57,12 @@ CBC_CommonDecoderResult* CBC_DataMatrixDecoder::Decode(
   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);
@@ -74,12 +73,11 @@ CBC_CommonDecoderResult* CBC_DataMatrixDecoder::Decode(
       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;