msvc: fix struct initialization for v19 compilers

msvc: fix struct initialization for v19 compilers

Newer version of MSVC do not show the error anymore, but I do get, e.g.:

  test_crypto.c(538,23): error C2059: syntax error: '}'

with version 19.38.33133 installed on a test system.

Change-Id: I13e34119303e056fdb51ff9925f4944171c824f2
Signed-off-by: Heiko Hund <heiko@ist.eigentlich.net>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1366
Message-Id: <20251111172504.7683-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg34327.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>