t5614: don't use subshells
Using a subshell for just one git command is both a waste in compute overhead (create a new process) as well as in line count. Suggested-by: NJeff King <peff@peff.net> Signed-off-by: NStefan Beller <sbeller@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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