Cleanse the key log buffer.
Reviewed-by:Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/7564)
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Reviewed-by:Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/7564)
mentioned in commit 030da743