ps: Fix conversion warnings related to send/recv return values

ps: Fix conversion warnings related to send/recv return values

We know that these values can't be big since they are limited
to the size of the input buffer. So we can explicitly cast
them to int if required.

Change-Id: Id070d1a45d45f9029309d23df7f3cab9ce792205
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1194
Message-Id: <20250924082121.23139-1-gert@greenie.muc.de>
URL: https://sourceforge.net/p/openvpn/mailman/message/59237926/
Signed-off-by: Gert Doering <gert@greenie.muc.de>