This will result in calling check_lifetime in nearest opportunity and
that function will adjust next time to call check_lifetime correctly.
Without this, check_lifetime is called in time computed by previous run,
not affecting modified lifetime.
Introduced by: commit 
5c766d642bcaf "ipv4: introduce address lifetime"
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
                        return -EEXIST;
                ifa = ifa_existing;
                set_ifa_lifetime(ifa, valid_lft, prefered_lft);
+               cancel_delayed_work(&check_lifetime_work);
+               schedule_delayed_work(&check_lifetime_work, 0);
                rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
                blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
        }