wifi: libertas: add missing calls to cancel_work_sync()

Add missing 'cancel_work_sync()' in 'if_sdio_remove()'
and on error handling path in 'if_sdio_probe()'.
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Tested-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230725060531.72968-1-dmantipov@yandex.ru

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

@@ -1233,6 +1233,7 @@ static int if_sdio_probe(struct sdio_func *func,
 	flush_workqueue(card->workqueue);
 	lbs_remove_card(priv);
 free:
+	cancel_work_sync(&card->packet_worker);
 	destroy_workqueue(card->workqueue);
 err_queue:
 	while (card->packets) {
@@ -1277,6 +1278,7 @@ static void if_sdio_remove(struct sdio_func *func)
 	lbs_stop_card(card->priv);
 	lbs_remove_card(card->priv);
 
+	cancel_work_sync(&card->packet_worker);
 	destroy_workqueue(card->workqueue);
 
 	while (card->packets) {