Merge branch 'sctp-dupcookie-fixes'

Xin Long says:

====================
sctp: a bunch of fixes for processing dupcookie

After introducing transport hashtable and per stream info into sctp,
some regressions were caused when processing dupcookie, this patchset
is to fix them.
====================

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