rxrpc: Replace conn->trans->{local,peer} with conn->params.{local,peer}

Replace accesses of conn->trans->{local,peer} with
conn->params.{local,peer} thus making it easier for a future commit to
remove the rxrpc_transport struct.

This also reduces the number of memory accesses involved.

Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 8c51745..becbaa7 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -583,7 +583,7 @@
 					goto maybe_error;
 			}
 
-			max = call->conn->trans->peer->maxdata;
+			max = call->conn->params.peer->maxdata;
 			max -= call->conn->security_size;
 			max &= ~(call->conn->size_align - 1UL);