iwlwifi: fix queue flush confusion

The flush_control parameter to iwlagn_txfifo_flush
is passed as an internal value (context flags) and
then sent to the device, that can't be right.

Fix the confusion by removing the parameter, always
use IWL_DROP_ALL that is redefined according to the
firmware API in the flush control.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/dvm/mac80211.c b/drivers/net/wireless/iwlwifi/dvm/mac80211.c
index 46b0d1c..cb443d5 100644
--- a/drivers/net/wireless/iwlwifi/dvm/mac80211.c
+++ b/drivers/net/wireless/iwlwifi/dvm/mac80211.c
@@ -1017,7 +1017,7 @@
 	 */
 	if (drop) {
 		IWL_DEBUG_MAC80211(priv, "send flush command\n");
-		if (iwlagn_txfifo_flush(priv, IWL_DROP_ALL)) {
+		if (iwlagn_txfifo_flush(priv)) {
 			IWL_ERR(priv, "flush request fail\n");
 			goto done;
 		}