math.combinatorics: fix tests for next-permutation.
math.combinatorics: fix tests for next-permutation.

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