Lennart Poettering
6606348981
This cleans up the handling of the "unset_environment" parameter to
sd_listen() and related calls: the man pages claim we operate on it on
error too. Hence, actually do so in strictly all error paths. Previously
we'd miss out on some, because wrapper functions mishandled them.
This was addressed before in 362dcfc5db
but some codepaths were missed. Complete the work now.
This establishes a common pattern: a function to unset the relevant env
vars, that is called from a goto section at the botom on both success
and failure.
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