ath10k: remove set but not used variable 'num_tdls_vifs'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/wireless/ath/ath10k/mac.c: In function 'ath10k_sta_state':
drivers/net/wireless/ath/ath10k/mac.c:6238:7: warning:
 variable 'num_tdls_vifs' set but not used [-Wunused-but-set-variable]

'num_tdls_vifs' not used any more after
  9a993cc1 ("ath10k: fix the logic of limiting tdls peer counts")

Also, remove the single called function ath10k_mac_tdls_vifs_count
and ath10k_mac_tdls_vifs_count_iter.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath10k/mac.c

@@ -5754,30 +5754,6 @@ static int ath10k_mac_tdls_vif_stations_count(struct ieee80211_hw *hw,
 	return data.num_tdls_stations;
 }
 
-static void ath10k_mac_tdls_vifs_count_iter(void *data, u8 *mac,
-					    struct ieee80211_vif *vif)
-{
-	struct ath10k_vif *arvif = (void *)vif->drv_priv;
-	int *num_tdls_vifs = data;
-
-	if (vif->type != NL80211_IFTYPE_STATION)
-		return;
-
-	if (ath10k_mac_tdls_vif_stations_count(arvif->ar->hw, vif) > 0)
-		(*num_tdls_vifs)++;
-}
-
-static int ath10k_mac_tdls_vifs_count(struct ieee80211_hw *hw)
-{
-	int num_tdls_vifs = 0;
-
-	ieee80211_iterate_active_interfaces_atomic(hw,
-						   IEEE80211_IFACE_ITER_NORMAL,
-						   ath10k_mac_tdls_vifs_count_iter,
-						   &num_tdls_vifs);
-	return num_tdls_vifs;
-}
-
 static int ath10k_hw_scan(struct ieee80211_hw *hw,
 			  struct ieee80211_vif *vif,
 			  struct ieee80211_scan_request *hw_req)
@@ -6285,7 +6261,6 @@ static int ath10k_sta_state(struct ieee80211_hw *hw,
 		 */
 		enum wmi_peer_type peer_type = WMI_PEER_TYPE_DEFAULT;
 		u32 num_tdls_stations;
-		u32 num_tdls_vifs;
 
 		ath10k_dbg(ar, ATH10K_DBG_MAC,
 			   "mac vdev %d peer create %pM (new sta) sta %d / %d peer %d / %d\n",
@@ -6303,7 +6278,6 @@ static int ath10k_sta_state(struct ieee80211_hw *hw,
 		}
 
 		num_tdls_stations = ath10k_mac_tdls_vif_stations_count(hw, vif);
-		num_tdls_vifs = ath10k_mac_tdls_vifs_count(hw);
 
 		if (sta->tdls) {
 			if (num_tdls_stations >= ar->max_num_tdls_vdevs) {