[Bug 266719] telnetd crashes if it receives IAC EC at session start

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266719

--- Comment #2 from Robert Morris <rtm@lcs.mit.edu> ---
Also, if the telnet client sends an authentication name, then a
KRB_FORWARD in an AUTHENTICATE sub-option for Kerberos5 but not
preceded by a KRB_AUTH, the "ticket" global variable is never
initialized, and there's a crash on this line in the server's
libtelnet/kerberos5.c in kerberos5_is()'s "case KRB_FORWARD":

        ret = krb5_cc_initialize (context,
                                  ccache,
                                  ticket->client);

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