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: ded845a7 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: NMiquel Raynal <miquel.raynal@bootlin.com>
Acked-by: NAlexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220125121426.848337-5-miquel.raynal@bootlin.comSigned-off-by: NStefan Schmidt <stefan@datenfreihafen.org>