TLS problems on nnimap (emacs22 and maybe emacs23)

[Steinar Bang <sb@dod.no>]

I saw this problem (at least I seem to remember that it had the same
offending commit) on emacs 23 on debian testing yesterday.  But it was
more elusive there.  After I had reset the bisect and had gone to head,
it went away, so I didn't report it there (I will check when I get home
that I actually correctly ended the git bisect).

Today I saw the issue on emacs22 on CentOS5.

The issue is that nnimap fails to open an IMAPS connection:
Opening connection to imap.mydomain.no via tls...
Opening TLS connection to `imap.mydomain.no'...
Opening TLS connection with `gnutls-cli --insecure -p 993 imap.mydomain.no'...failed
Opening TLS connection with `gnutls-cli --insecure -p 993 imap.mydomain.no --protocols ssl3'...failed
Opening TLS connection with `openssl s_client -connect imap.mydomain.no:993 -no_ssl2 -ign_eof'...done
Opening TLS connection to `imap.mydomain.no'...done
proto-stream-get-response: Wrong type argument: stringp, nil

git bisect tells me this:

~/git/gnus$ git bisect good
978b28444a45be09524682cacbd95fca9e9d28f5 is the first bad commit
commit 978b28444a45be09524682cacbd95fca9e9d28f5
Author: Lars Ingebrigtsen <larsi@rusty.(none)>
Date:   Thu Jan 26 20:30:11 2012 +0100

    Wait for :end-of-capability, not :end-of-command.

:040000 040000 29e1ce17851ae3f872f8ba5657e94089046c25fc f2ebff9b74dfbe864057207112b062e3933c02de M      lisp