events: Make sure rwflags are treated as unsigned

events: Make sure rwflags are treated as unsigned

event_set_return.rwflags is already unsigned, make sure the
flags are as well to avoid spurious conversion warnings.

Requires to change rwflags in proxy_connection struct as
well since those use the same flags.

Change-Id: I0272b709b907545de05bfded03a649b259ce5af6
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
URL: https://gerrit.openvpn.net/c/openvpn/+/1107
Message-Id: <20250914135128.19621-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg32918.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>