firewire: core: normalize a function argument name

It's called "payload" rather than "data" almost everywhere in
fw-transaction.c.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/fw-transaction.c

@@ -317,15 +317,15 @@ static void transaction_callback(struct fw_card *card, int rcode,
  */
 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
 		       int generation, int speed, unsigned long long offset,
-		       void *data, size_t length)
+		       void *payload, size_t length)
 {
 	struct transaction_callback_data d;
 	struct fw_transaction t;
 
 	init_completion(&d.done);
-	d.payload = data;
+	d.payload = payload;
 	fw_send_request(card, &t, tcode, destination_id, generation, speed,
-			offset, data, length, transaction_callback, &d);
+			offset, payload, length, transaction_callback, &d);
 	wait_for_completion(&d.done);
 
 	return d.rcode;

drivers/firewire/fw-transaction.h

@@ -405,14 +405,14 @@ int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset);
 
 void fw_send_request(struct fw_card *card, struct fw_transaction *t,
 		int tcode, int destination_id, int generation, int speed,
-		unsigned long long offset, void *data, size_t length,
+		unsigned long long offset, void *payload, size_t length,
 		fw_transaction_callback_t callback, void *callback_data);
 int fw_cancel_transaction(struct fw_card *card,
 			  struct fw_transaction *transaction);
 void fw_flush_transactions(struct fw_card *card);
 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
 		       int generation, int speed, unsigned long long offset,
-		       void *data, size_t length);
+		       void *payload, size_t length);
 void fw_send_phy_config(struct fw_card *card,
 			int node_id, int generation, int gap_count);