wifi: libertas: main: don't call kfree_skb() under spin_lock_irqsave()

It is not allowed to call kfree_skb() from hardware interrupt
context or with interrupts being disabled. So replace kfree_skb()
with dev_kfree_skb_irq() under spin_lock_irqsave(). Compile
tested only.

Fixes: d2e7b342 ("libertas: disable functionality when interface is down")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221207150008.111743-4-yangyingliang@huawei.com

drivers/net/wireless/marvell/libertas/main.c

@@ -216,7 +216,7 @@ int lbs_stop_iface(struct lbs_private *priv)
 
 	spin_lock_irqsave(&priv->driver_lock, flags);
 	priv->iface_running = false;
-	kfree_skb(priv->currenttxskb);
+	dev_kfree_skb_irq(priv->currenttxskb);
 	priv->currenttxskb = NULL;
 	priv->tx_pending_len = 0;
 	spin_unlock_irqrestore(&priv->driver_lock, flags);