polarssl: fix unreachable code

Found via cppcheck and compile-tested.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <1416745303-23641-1-git-send-email-yegorslists@googlemail.com>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9266
Signed-off-by: Gert Doering <gert@greenie.muc.de>