The attached patch makes DECnet routing only use routers from the same
area - rather than the highest rated router seen.

In theory there should not be an out-of-area router on a local network
but some networks are bridged rather than properly routed. VMS seems
to behave similarly: if I bring up a VMS node with no router then it
can't see anything else on the global network.
Signed-off-by: NPatrick Caulfield <patrick@tykepenguin.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>