Merge branch 'tipc-dad-fixes'

Jon Maloy says:

====================
tipc: fixes in duplicate address discovery function

commit 25b0b9c4

 ("tipc: handle collisions of 32-bit node address
hash values") introduced new functionality that has turned out to
contain several bugs and weaknesses.

We address those in this series.
====================

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