ceph: messenger: rework prepare_connect_authorizer()

static int prepare_connect_authorizer(struct ceph_connection *con)

{

	void *auth_buf;

	int auth_len = 0;

	int auth_protocol = 0;

	int auth_len;

	int auth_protocol;

	if (!con->ops->get_authorizer) {

		con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;

		con->out_connect.authorizer_len = 0;

		return 0;

	}

	/* Can't hold the mutex while getting authorizer */

	mutex_unlock(&con->mutex);

	if (con->ops->get_authorizer)

		con->ops->get_authorizer(con, &auth_buf, &auth_len,

					 &auth_protocol, &con->auth_reply_buf,

					 &con->auth_reply_buf_len,

	auth_buf = NULL;

	auth_len = 0;

	auth_protocol = CEPH_AUTH_UNKNOWN;

	con->ops->get_authorizer(con, &auth_buf, &auth_len, &auth_protocol,

				&con->auth_reply_buf, &con->auth_reply_buf_len,

				con->auth_retry);

	mutex_lock(&con->mutex);

	if (test_bit(CLOSED, &con->state) ||

	    test_bit(OPENING, &con->state))

	if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->state))

		return -EAGAIN;

	con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);