openssl: use crypto_msg(), get rid of openssl-specific code in error.c

openssl: use crypto_msg(), get rid of openssl-specific code in error.c

v2 - don't wrap string for a couple of words, and be more consistent
     with wrapping (use curly braces for ifs with wrapping statements)

v3 - change an incorrect crypto_msg() call back to msg()

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <54A430A2.5000409@karger.me>
URL: http://article.gmane.org/gmane.network.openvpn.devel/9374
Signed-off-by: Gert Doering <gert@greenie.muc.de>