[General] Code refinement to avoid some compiling warnings.

JMVC/H264Extension/include/CodingParameter.h

JMVC/H264Extension/src/lib/H264AVCCommonLib/TraceFile.cpp

...264Extension/src/lib/H264AVCDecoderLib/H264AVCDecoder.cpp

JMVC/H264Extension/src/lib/H264AVCDecoderLib/SliceReader.cpp

JMVC/H264Extension/src/lib/H264AVCEncoderLib/PicEncoder.cpp

JMVC/H264Extension/src/lib/H264AVCEncoderLib/PicEncoder.h

...ion/src/test/H264AVCDecoderLibTest/H264AVCDecoderTest.cpp

...n/src/test/H264AVCEncoderLibTest/EncoderCodingParameter.h