fix route struct name

This slipped in with commit d0085293.

Signed-off-by: Heiko Hund <heiko.hund@sophos.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1396346803-31772-1-git-send-email-heiko.hund@sophos.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/8421
Signed-off-by: Gert Doering <gert@greenie.muc.de>