sctp: remove the typedef sctp_sack_chunk_t

This patch is to remove the typedef sctp_sack_chunk_t, and
replace with struct sctp_sack_chunk in the places where it's
using this typedef.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 1323d41..681b181 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -221,7 +221,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
 	    asoc->outqueue.out_qlen == 0 &&
 	    list_empty(&asoc->outqueue.retransmit) &&
 	    msg_len > max_data)
-		first_len -= SCTP_PAD4(sizeof(sctp_sack_chunk_t));
+		first_len -= SCTP_PAD4(sizeof(struct sctp_sack_chunk));
 
 	/* Encourage Cookie-ECHO bundling. */
 	if (asoc->state < SCTP_STATE_COOKIE_ECHOED)