iwlagn: upper layer stores iwl_rxon_context in skb's CB

This removes the need for iwl_tx_info.
Each tx queue holds an array of skbs, the transport layer doesn't
need to know anything about the context in which a specific skb is
sent.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
index 8edb3f8..60ba4f8 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -454,7 +454,9 @@
 
 	iwl_update_stats(priv, true, fc, len);
 
-	if (iwl_trans_tx(trans(priv), skb, tx_cmd, txq_id, fc, is_agg, ctx))
+	info->driver_data[0] = ctx;
+
+	if (iwl_trans_tx(trans(priv), skb, tx_cmd, txq_id, fc, is_agg))
 		goto drop_unlock_sta;
 
 	if (ieee80211_is_data_qos(fc)) {