pkcs11: Avoid some conversion warnings

pkcs11: Avoid some conversion warnings

Since we translate between different APIs
casts are unavoidable. Make sure they are safe.

Change-Id: If3331a2d0477634af077b4c29963dbec6d04e17b
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1296
Message-Id: <20251111172531.7754-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg34328.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>