Fix the code that causes warnings

xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp

Index: xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
diff --git a/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp b/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
index 15f288be63ce3c67252f030cf2ed046745c58c0b..19672c1b715336893bafbe62a4359098caf1bc5a 100644
--- a/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
+++ b/xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.cpp
@@ -158,7 +158,7 @@ int32_t CBC_HighLevelEncoder::lookAheadTest(CFX_WideString msg,
   int32_t charsProcessed = 0;
   while (TRUE) {
     if ((startpos + charsProcessed) == msg.GetLength()) {
-      uint32_t min = std::numeric_limits<int32_t>::max();
+      int32_t min = std::numeric_limits<int32_t>::max();
       CFX_ByteArray mins;
       mins.SetSize(6);
       CFX_Int32Array intCharCounts;