It's only purpose seems to be to break ifconfig. It often gets enabled by
default by distributors who like to set everything on, and it just confuses
people.

The functionality is available via netlink anyway - which is what anyone using
DECnet will be using for configuration.
Signed-off-by: Patrick Caulfield <patrick@tykepenguin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>