comp: Make sure comp flags are treated as unsigned

comp: Make sure comp flags are treated as unsigned

compress_options.flags is already unsigned. Make sure
the individual flags are as well to avoid spurious
conversion warnings.

Change-Id: I6a0d352a039a0936cb9bbedf6168cd6eecd053ea
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Message-Id: <20250826185007.22157-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg32689.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>