rt2x00: Reverse calling order of bus write_tx_desc and driver write_tx_desc.

For rt2800 reverse the calling order of rt2x00pci_write_data and
rt2800pci_write_data. Currently rt2800pci_write_data calls rt2x00pci_write_data
as there can be only 1 driver callback function specified by the driver.
Reverse this calling order by introducing a new driver callback function,
called write_tx_datadesc, which is called from the bus-specific write_tx_data
functions.
Preparation for futher cleanups in the skb data handling of rt2x00.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800pci.c b/drivers/net/wireless/rt2x00/rt2800pci.c
index 88dba7f..72e4f29 100644
--- a/drivers/net/wireless/rt2x00/rt2800pci.c
+++ b/drivers/net/wireless/rt2x00/rt2800pci.c
@@ -613,18 +613,10 @@
 /*
  * TX descriptor initialization
  */
-static int rt2800pci_write_tx_data(struct queue_entry* entry,
-				   struct txentry_desc *txdesc)
+static void rt2800pci_write_tx_datadesc(struct queue_entry* entry,
+					 struct txentry_desc *txdesc)
 {
-	int ret;
-
-	ret = rt2x00pci_write_tx_data(entry, txdesc);
-	if (ret)
-		return ret;
-
 	rt2800_write_txwi(entry->skb, txdesc);
-
-	return 0;
 }
 
 
@@ -1079,7 +1071,8 @@
 	.reset_tuner		= rt2800_reset_tuner,
 	.link_tuner		= rt2800_link_tuner,
 	.write_tx_desc		= rt2800pci_write_tx_desc,
-	.write_tx_data		= rt2800pci_write_tx_data,
+	.write_tx_data		= rt2x00pci_write_tx_data,
+	.write_tx_datadesc	= rt2800pci_write_tx_datadesc,
 	.write_beacon		= rt2800pci_write_beacon,
 	.kick_tx_queue		= rt2800pci_kick_tx_queue,
 	.kill_tx_queue		= rt2800pci_kill_tx_queue,