Remove unused assignment of objstorage.add's return value

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Migrated from D8015 (view on Phabricator)

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Patch application report for D8015 (id=28880)

Rebasing onto 8b722348...

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commit 98cbb35af4782425b4fd1ffdd0ecc11a3ec39184
Author: Valentin Lorentz <vlorentz@softwareheritage.org>
Date:   Wed Jun 22 11:13:07 2022 +0200

    Remove unused assignment of objstorage.add's return value

See https://jenkins.softwareheritage.org/job/DOBJSRPL/job/tests-on-diff/40/ for more details.

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