firewire: Fix bit shift typo.

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.c b/drivers/firewire/fw-transaction.c
index 8387c8e..4a48e2d 100644
--- a/drivers/firewire/fw-transaction.c
+++ b/drivers/firewire/fw-transaction.c
@@ -48,7 +48,7 @@
 
 #define header_get_tcode(q)		(((q) >> 4) & 0x0f)
 #define header_get_tlabel(q)		(((q) >> 10) & 0x3f)
-#define header_get_rcode(q)		(((q) >> 4) & 0x0f)
+#define header_get_rcode(q)		(((q) >> 12) & 0x0f)
 #define header_get_destination(q)	(((q) >> 16) & 0xffff)
 #define header_get_source(q)		(((q) >> 16) & 0xffff)
 #define header_get_offset_high(q)	(((q) >> 0) & 0xffff)