tests ~ (sub-crate/factor) fix `divisor(0,0)` test of factor::numeric::gcd() with early value check and return (fixes #1587)
tests ~ (sub-crate/factor) fix `divisor(0,0)` test of factor::numeric::gcd() with early value check and return (fixes #1587)

uutils/coreutils,uutils/coreutils,uutils/coreutils