datapath: Fix log message in ovs conntrack

datapath: Fix log message in ovs conntrack

Upstream commit:
commit 12c6bc38f99bb168b7f16bdb5e855a51a23ee9ec
Author: Yi-Hung Wei <yihung.wei@gmail.com>
Date:   Wed Aug 21 17:16:10 2019 -0700

    openvswitch: Fix log message in ovs conntrack

    Fixes: 06bd2bdf19d2 ("openvswitch: Add timeout support to ct action")
    Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Yi-Hung Wei <yihung.wei@gmail.com>
Reviewed-by: Yifeng Sun <pkusunyifeng@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>