Fix a build warning
Fix a build warning

j717273419/OpenCC,PeterCxy/OpenCC,PeterCxy/OpenCC,j717273419/OpenCC,BYVoid/OpenCC,xuecai/OpenCC,BYVoid/OpenCC,jakwings/OpenCC,xuecai/OpenCC,wisperwinter/OpenCC,Arthur2e5/OpenCC,Arthur2e5/OpenCC,wisperwinter/OpenCC,xuecai/OpenCC,capturePointer/OpenCC,wisperwinter/OpenCC,mxgit1090/OpenCC,PeterCxy/OpenCC,jakwings/OpenCC,mxgit1090/OpenCC,capturePointer/OpenCC,chongwf/OpenCC,chongwf/OpenCC,Arthur2e5/OpenCC,BYVoid/OpenCC,mxgit1090/OpenCC,chongwf/OpenCC,mxgit1090/OpenCC,BYVoid/OpenCC,BYVoid/OpenCC,j717273419/OpenCC,capturePointer/OpenCC,BYVoid/OpenCC,jakwings/OpenCC