bug#10891: bug fix lisp/url/url-http.el

[Chong Yidong]

Devon Sean McCullough <emacs-hacker2012@jovi.net> writes:

> (let ((url-gateway-unplugged t))
>   (url-retrieve-synchronously "http://gnu.org";))
>
> bombs
>       Wrong type argument: processp, nil
>
> should be
>       Could not create connection to gnu.org:80
>
> PS: Here's the fix

Thanks.  I've committed a slightly tweaked version of the fix to trunk.