lib-bash.sh: move `then` onto its own line
The code style for tests is to have statements on their own line if
possible. Move the `then` onto its own line so that it conforms with the
test style.
Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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