socket: Never use negative buf->len in link_socket_read*

socket: Never use negative buf->len in link_socket_read*

We really don't want to use negative buf lengths in
our code. So remove some places where we did so before.

Change-Id: Iabe1992b2608661b862a81363574e957d18395f0
Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1554
Message-Id: <20260708152847.60245-1-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg37536.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>