Change type of max_clients to uint32_t

Change type of max_clients to uint32_t

peer_id is mostly this already (except in DCO
context for some reason), and max_peerid was
defined as uint32_t as well. So changing max_clients
to uint32_t avoids many -Wsign-compare warnings.

While here fix limit for max_clients in options
parsing. It is not allowed to be MAX_PEER_ID
exactly.

Change-Id: I8d6b7bc1b7744dc6d57aaed3231b8901275752f2
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1564
Message-Id: <20260407112434.5588-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg36535.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>