Fix md_kt_size in mbed TLS when queried for size of "none"

Fix md_kt_size in mbed TLS when queried for size of "none"

Previously this would error out with a M_FATAL message about cipher
not known. Align the mbed TLS version to OpenSSL version and also remove
unreachable code. This manifested in key_print2() running into this
M_FATAL message when used with an AEAD cipher and verb 7.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20221109115208.1248948-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg25494.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>