os: drop unused return value in TestLookupEnv
Change-Id: Ibf227dcfefa179b1c3378476bcd17100b1b1c01e Reviewed-on: https://go-review.googlesource.com/81375 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Ian Lance Taylor <iant@golang.org>
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