Fix t4201: accidental arithmetic expansion
instead of embedded subshell. It actually breaks here (dash as /bin/sh): t4201-shortlog.sh: 27: Syntax error: Missing '))' FATAL: Unexpected exit with code 2 Signed-off-by: Alex Riesen <raa.lkml@gmail.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
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