iwlagn: add an API for TX stop

Tx stop moves to transport layer.

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-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index 25a592a..a926142 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -2310,7 +2310,7 @@
 	 * already dead.
 	 */
 	if (test_bit(STATUS_DEVICE_ENABLED, &priv->status)) {
-		iwlagn_txq_ctx_stop(priv);
+		priv->trans.ops->tx_stop(priv);
 		priv->trans.ops->rx_stop(priv);
 
 		/* Power-down device's busmaster DMA clocks */