mail/dovecot 1.2.4 breaks gssapi authentication

[John Marshall]

Yesterday I upgraded a Dovecot installation from 1.1.16 to 1.2.4 and
spent a few hours trying to figure out why GSSAPI authentication was
failing.  It turned out to be due to some extra username checking
introduced to Dovecot just prior to the 1.2.4 release.

If I set 'auth_debug = yes' in dovecot.conf, I would see messages logged
reporting 'authz_name has NULs' and then a FAIL message sent to the
client.

The Dovecot folks have provided a patch which I have included and
written up in a PR for the mail/dovecot port:
<http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/138300>

-- 
John Marshall
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