small fixes

[Nikos Mavrogiannopoulos]

By reading gnutls.c I have the following fixes. A question is, whether
the DISABLE_SAFE_RENEGOTIATION flag is intentional. I see that I
copied that to ocserv, but as far as I know this has no
interoperability issues, and using it, makes known attacks apply to
openconnect.

regards,
Nikos
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