net: ieee802154: ca8210: Stop leaking skb's

Upon error the ieee802154_xmit_complete() helper is not called. Only
ieee802154_wake_queue() is called manually. We then leak the skb
structure.

Free the skb structure upon error before returning.

Fixes: ded845a ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/net/ieee802154/ca8210.c

@@ -1772,6 +1772,7 @@ static int ca8210_async_xmit_complete(
 		);
 		if (status != MAC_TRANSACTION_OVERFLOW) {
 			ieee802154_wake_queue(priv->hw);
+			dev_kfree_skb_any(atusb->tx_skb);
 			return 0;
 		}
 	}