sctp: implement enqueue_event for sctp_stream_interleave

enqueue_event is added as a member of sctp_stream_interleave, used to
enqueue either data, idata or notification events into user socket rx
queue.

It replaces sctp_ulpq_tail_event used in the other places with
enqueue_event.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/stream_interleave.c b/net/sctp/stream_interleave.c
index 8238311..e853972 100644
--- a/net/sctp/stream_interleave.c
+++ b/net/sctp/stream_interleave.c
@@ -552,6 +552,7 @@ static struct sctp_stream_interleave sctp_stream_interleave_0 = {
 	.assign_number		= sctp_chunk_assign_ssn,
 	.validate_data		= sctp_validate_data,
 	.ulpevent_data		= sctp_ulpq_tail_data,
+	.enqueue_event		= sctp_ulpq_tail_event,
 };
 
 static struct sctp_stream_interleave sctp_stream_interleave_1 = {
@@ -561,6 +562,7 @@ static struct sctp_stream_interleave sctp_stream_interleave_1 = {
 	.assign_number		= sctp_chunk_assign_mid,
 	.validate_data		= sctp_validate_idata,
 	.ulpevent_data		= sctp_ulpevent_idata,
+	.enqueue_event		= sctp_enqueue_event,
 };
 
 void sctp_stream_interleave_init(struct sctp_stream *stream)