fix missing cleanup, if response socket is no longer writeable (issue…

… 1547) (#1593)

Relates to issue #1547, see my [comment
there](#1547 (comment))

Co-authored-by: Jan Kaiser <jan.kaiser@boerse-go.de>
Co-authored-by: titanism <101466223+titanism@users.noreply.github.com>

Release 2.15.3

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