crypto: Make some casts to int explicit

crypto: Make some casts to int explicit

In all of these cases the cast is safe to do
since we have limits imposed in other ways.

And we want those values as int, so no
alternative to casting.

Change-Id: I3b8dd8d5671e31dba2a23a0a78f36d9dda034b88
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1217
Message-Id: <20251008092859.875-1-gert@greenie.muc.de>
URL: https://sourceforge.net/p/openvpn/mailman/message/59243794/
Signed-off-by: Gert Doering <gert@greenie.muc.de>