firewire: Implement topology map and fix a couple of loopback bugs.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/fw-topology.h b/drivers/firewire/fw-topology.h
index f2a575e..913bfe1 100644
--- a/drivers/firewire/fw-topology.h
+++ b/drivers/firewire/fw-topology.h
@@ -88,4 +88,7 @@
 void
 fw_destroy_nodes(struct fw_card *card);
 
+u16
+crc16_itu_t(const u32 *buffer, size_t length);
+
 #endif /* __fw_topology_h */