firewire: remove an unused function argument

void (*fw_address_callback_t)(..., int speed, ...) is the speed that a
remote node chose to transmit a request to us.  In case of split
transactions, firewire-core will transmit the response at that speed.

Upper layer drivers on the other hand (firewire-net, -sbp2, firedtv, and
userspace drivers) cannot do anything useful with that speed datum,
except log it for debug purposes.  But data that is merely potentially
(not even actually) used for debug purposes does not belong into the API.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index ae715c8..1931964 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -410,8 +410,7 @@
 
 static void sbp2_status_write(struct fw_card *card, struct fw_request *request,
 			      int tcode, int destination, int source,
-			      int generation, int speed,
-			      unsigned long long offset,
+			      int generation, unsigned long long offset,
 			      void *payload, size_t length, void *callback_data)
 {
 	struct sbp2_logical_unit *lu = callback_data;