iwlwifi: remove never-changing priv->rates_mask variable

It's always just IWL_RATES_MASK.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index d0fab87..e7e4bf7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2103,8 +2103,8 @@
 
 	ieee80211_wake_queues(priv->hw);
 
-	priv->active_rate = priv->rates_mask;
-	priv->active_rate_basic = priv->rates_mask & IWL_BASIC_RATES_MASK;
+	priv->active_rate = IWL_RATES_MASK;
+	priv->active_rate_basic = IWL_RATES_MASK & IWL_BASIC_RATES_MASK;
 
 	/* Configure Tx antenna selection based on H/W config */
 	if (priv->cfg->ops->hcmd->set_tx_ant)
@@ -3392,7 +3392,6 @@
 	priv->qos_data.qos_active = 0;
 	priv->qos_data.qos_cap.val = 0;
 
-	priv->rates_mask = IWL_RATES_MASK;
 	/* Set the tx_power_user_lmt to the lowest power level
 	 * this value will get overwritten by channel max power avg
 	 * from eeprom */