fix compiler warning on linux
fix compiler warning on linux

factor/factor,sarvex/factor-lang,factor/factor,sarvex/factor-lang,dch/factor,nicolas-p/factor,dch/factor,factor/factor,slavapestov/factor,bpollack/factor,nicolas-p/factor,tgunr/factor,slavapestov/factor,dch/factor,dch/factor,tgunr/factor,nicolas-p/factor,slavapestov/factor,AlexIljin/factor,factor/factor,mrjbq7/factor,tgunr/factor,bpollack/factor,AlexIljin/factor,nicolas-p/factor,nicolas-p/factor,tgunr/factor,slavapestov/factor,slavapestov/factor,dch/factor,bpollack/factor,bjourne/factor,sarvex/factor-lang,bpollack/factor,mrjbq7/factor,sarvex/factor-lang,nicolas-p/factor,tgunr/factor,dch/factor,bjourne/factor,sarvex/factor-lang,slavapestov/factor,factor/factor,sarvex/factor-lang,bjourne/factor,nicolas-p/factor,tgunr/factor,bjourne/factor,bpollack/factor,sarvex/factor-lang,factor/factor,AlexIljin/factor,slavapestov/factor,mrjbq7/factor,bjourne/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,bjourne/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,bjourne/factor,AlexIljin/factor,AlexIljin/factor,mrjbq7/factor