at86rf230: remove unnecessary / dead code

In at86rf230_probe() lp was first set to dev->priv and a few lines later
dev->priv was set to lp again, without changing lp in between. The call
to ieee802154_unregister_device() before err_irq: was unreachable.
Signed-off-by: NSascha Herrmann <sascha@ps.nvbi.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ieee802154/at86rf230.c

@@ -838,7 +838,6 @@ static int at86rf230_probe(struct spi_device *spi)
 
 	lp->spi = spi;
 
-	dev->priv = lp;
 	dev->parent = &spi->dev;
 	dev->extra_tx_headroom = 0;
 	/* We do support only 2.4 Ghz */
@@ -940,7 +939,6 @@ static int at86rf230_probe(struct spi_device *spi)
 
 	return rc;
 
-	ieee802154_unregister_device(lp->dev);
 err_irq:
 	free_irq(spi->irq, lp);
 	flush_work(&lp->irqwork);