[SCTP]: Implement SCTP_ADDR_CONFIRMED state for ADDR_CHNAGE event

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index 9a83527..4ed7521 100644
--- a/include/net/sctp/user.h
+++ b/include/net/sctp/user.h
@@ -265,6 +265,7 @@
 	SCTP_ADDR_REMOVED,
 	SCTP_ADDR_ADDED,
 	SCTP_ADDR_MADE_PRIM,
+	SCTP_ADDR_CONFIRMED,
 };