[portability] remove another bashism in regression-tester
[portability] remove another bashism in regression-tester

olorin/miller,0-wiz-0/miller,0-wiz-0/miller,olorin/miller,olorin/miller,olorin/miller,0-wiz-0/miller,olorin/miller,olorin/miller,0-wiz-0/miller,olorin/miller,0-wiz-0/miller,0-wiz-0/miller,0-wiz-0/miller,0-wiz-0/miller,olorin/miller