mt76x0: use mt76_wcid_free in mt76x0

Use helper from util instead of custom code.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mediatek/mt76/mt76x0/main.c

@@ -197,7 +197,7 @@ mt76x0_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	mutex_lock(&dev->mt76.mutex);
 	rcu_assign_pointer(dev->wcid[idx], NULL);
 	mt76x02_mac_wcid_set_drop(&dev->mt76, idx, true);
-	dev->wcid_mask[idx / BITS_PER_LONG] &= ~BIT(idx % BITS_PER_LONG);
+	mt76_wcid_free(dev->wcid_mask, idx);
 	mt76x02_mac_wcid_setup(&dev->mt76, idx, 0, NULL);
 	mt76x0_mac_set_ampdu_factor(dev);
 	mutex_unlock(&dev->mt76.mutex);