While enhancing the neighbour code to handle multiple network
namespaces I noticed that decnet is assuming neigh_parms_alloc
will allways succeed, which is clearly wrong.  So handle the
failure.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Acked-by: NSteven Whitehouse <steve@chygwyn.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>