[smtpmail.el] starttls doesn't work if port is a string

[Jesper Harder]

In GNU Emacs 21.3.50.46 (i686-pc-linux-gnu, GTK+ Version 2.0.2)
 of 2004-02-09 on defun.localdomain

I don't know if the code or the manual is wrong, but it doesn't work
to use a string for the port number in `smtpmail-starttls-credentials'.

I.e. something like

  (setq smtpmail-starttls-credentials 
        '(("smtp.example.com" "25" nil nil)))

doesn't work, but

  (setq smtpmail-starttls-credentials 
        '(("smtp.example.com" 25 nil nil)))

_does_ work for me.  According to <info://smtpmail/Authentication>
either one should work.

BTW, there's also a typo in `smtpmail-try-auth-methods':

*** /home/harder/emacs/lisp/mail/smtpmail.el.~1.64.~    Wed Feb  4 20:16:45 2004
--- /home/harder/emacs/lisp/mail/smtpmail.el    Wed Feb 11 00:44:14 2004
***************
*** 496,502 ****
                               (netrc-get hostentry "login")
                               (netrc-get hostentry "password"))))
                 (smtpmail-find-credentials
!                 smtpmail-auth-credentiaals host port)))
         (passwd (when cred
                   (or (smtpmail-cred-passwd cred)
                       (read-passwd
--- 496,502 ----
                               (netrc-get hostentry "login")
                               (netrc-get hostentry "password"))))
                 (smtpmail-find-credentials
!                 smtpmail-auth-credentials host port)))
         (passwd (when cred
                   (or (smtpmail-cred-passwd cred)
                       (read-passwd