mbedtls: fix typ0 in comment

mbedtls: fix typ0 in comment

the function used to set the verify callback in mbedTLS is
actually called mbedtls_ssl_conf_verify() and it is invoked
in key_state_ssl_init().

Fix comment accordingly.

Signed-off-by: Antonio Quartulli <antonio@openvpn.net>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <20171205085711.25075-1-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg16026.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit c68a025a1ca687c19d7ae8599464f768b7525df5)