netdev - re iproute2 - don't return error on success fix

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Message-ID: <CAJ3xEMiasPrGAQkY=uVxCaFG_An1cm+emJCc6jr76=xuLcQ=0Q@mail.gmail.com>
Date:   Thu, 27 Sep 2018 15:22:41 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     David Ahern <dsahern@...il.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Roi Dayan <roid@...lanox.com>
Subject: re iproute2 - don't return error on success fix

Something is still broken also after commit b45e300 "libnetlink: don't
return error on success" - when error is returned, the error code is
success..

$ tc filter add dev enp33s0f0 protocol ip parent ffff: flower skip_sw
ip_flags nofirstfrag action drop && echo "success" || echo "failed"

RTNETLINK answers: Operation not supported
success