rt2x00: Register frame length in TX entry descriptor instead of L2PAD.

And use it consistently in the chipset drivers.
Preparation for further clean ups.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index a68cf90..59d9459 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -333,12 +333,10 @@
 	txdesc->aifs = entry->queue->aifs;
 
 	/*
-	 * Header and alignment information.
+	 * Header and frame information.
 	 */
+	txdesc->length = entry->skb->len;
 	txdesc->header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
-	if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags) &&
-	    (entry->skb->len > txdesc->header_length))
-		txdesc->l2pad = L2PAD_SIZE(txdesc->header_length);
 
 	/*
 	 * Check whether this frame is to be acked.