Call soup_message_io_stop so we don't get a callback on the io after it's

Call soup_message_io_stop so we don't get a callback on the io after it's

        * libsoup/soup-message-io.c (io_cleanup): Call
        soup_message_io_stop so we don't get a callback on the io after
        it's been cleaned up.

        * libsoup/soup-session.c (add_auth): Only remove the Authorization
        header if we have another one to add. (Otherwise it messes up
        SoupConnectionNTLM.)