mt76: mt7615: usb: cancel ps work stopping the vif

Cancel possible power_save work before stopping the mt7663u interface
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/usb.c

@@ -51,6 +51,7 @@ static void mt7663u_stop(struct ieee80211_hw *hw)
 	struct mt7615_dev *dev = hw->priv;
 
 	clear_bit(MT76_STATE_RUNNING, &dev->mphy.state);
+	cancel_work_sync(&phy->ps_work);
 	cancel_delayed_work_sync(&phy->scan_work);
 	cancel_delayed_work_sync(&phy->mac_work);
 	mt76u_stop_tx(&dev->mt76);