multi: don't call DCO APIs if DCO is disabled

multi: don't call DCO APIs if DCO is disabled

The agreement with the DCO submodule is that no API should be called if
DCO is actually disabled. For this reason, every invocation must happen
only after having checked that dco_enabled() returns true.

Add missing checks before invoking dco_get_peer_stats_multi()

Reported-by: Lev Stipakov <lev@openvpn.net>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Acked-by: Lev Stipakov <lstipakov@gmail.com>
Message-Id: <20230321102842.10780-1-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26458.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>