[SCTP]: Extend /proc/net/sctp/snmp to provide more statistics.

This patch adds more statistics info under /proc/net/sctp/snmp
that should be useful for debugging. The additional events that
are counted now include timer expirations, retransmits, packet
and data chunk discards.

The Data chunk discards include all the cases where a data chunk
is discarded including high tsn, bad stream, dup tsn and the most
useful one(out of receive buffer/rwnd).

Also moved the SCTP MIB data structures from the generic include
directories to include/sctp/sctp.h.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/inqueue.c b/net/sctp/inqueue.c
index cf0c767..cf6deed 100644
--- a/net/sctp/inqueue.c
+++ b/net/sctp/inqueue.c
@@ -87,7 +87,7 @@
 /* Put a new packet in an SCTP inqueue.
  * We assume that packet->sctp_hdr is set and in host byte order.
  */
-void sctp_inq_push(struct sctp_inq *q, struct sctp_chunk *packet)
+void sctp_inq_push(struct sctp_inq *q, struct sctp_chunk *chunk)
 {
 	/* Directly call the packet handling routine. */
 
@@ -96,7 +96,7 @@
 	 * Eventually, we should clean up inqueue to not rely
 	 * on the BH related data structures.
 	 */
-	list_add_tail(&packet->list, &q->in_chunk_list);
+	list_add_tail(&chunk->list, &q->in_chunk_list);
 	q->immediate.func(q->immediate.data);
 }