Merge branch 'mpls-multipath-route-cleanups'

David Ahern says:

====================
net: mpls: multipath route cleanups

When a device associated with a nexthop is deleted, the nexthop in
the route is effectively removed, so remove it from the route dump.

Further, when all nexhops have been deleted the route is effectively
done, so remove the route.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>