rxrpc: Trace rxrpc_call usage

Add a trace event for debuging rxrpc_call struct usage.

Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index ef9ef0d..03af88f 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -129,8 +129,7 @@
 			_debug("conn ready");
 			call->state = RXRPC_CALL_SERVER_ACCEPTING;
 			list_add_tail(&call->accept_link, &rx->acceptq);
-			rxrpc_get_call(call);
-			atomic_inc(&call->skb_count);
+			rxrpc_get_call_for_skb(call, notification);
 			nsp = rxrpc_skb(notification);
 			nsp->call = call;
 
@@ -323,6 +322,7 @@
 	call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);
 	list_del_init(&call->accept_link);
 	sk_acceptq_removed(&rx->sk);
+	rxrpc_see_call(call);
 
 	write_lock_bh(&call->state_lock);
 	switch (call->state) {
@@ -395,6 +395,7 @@
 	call = list_entry(rx->acceptq.next, struct rxrpc_call, accept_link);
 	list_del_init(&call->accept_link);
 	sk_acceptq_removed(&rx->sk);
+	rxrpc_see_call(call);
 
 	write_lock_bh(&call->state_lock);
 	switch (call->state) {