This can be reverted as shutdown and cookie_ack chunk are using the
same asoc since the last patch.

This reverts commit 145cb2f7.
Signed-off-by: NXin Long <lucien.xin@gmail.com>
Acked-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>