firewire: Sanitize send error codes.

Drop the negative errnos and use RCODEs for all error codes
in the complete transaction callback.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h
index fb46ef7..ad7ba32 100644
--- a/drivers/firewire/fw-transaction.h
+++ b/drivers/firewire/fw-transaction.h
@@ -87,6 +87,8 @@
 #define RCODE_SEND_ERROR	0x10
 #define RCODE_CANCELLED		0x11
 #define RCODE_BUSY		0x12
+#define RCODE_GENERATION	0x13
+#define RCODE_NO_ACK		0x14
 
 #define RETRY_1	0x00
 #define RETRY_X	0x01