net: mv643xx_eth: undo some opreations in mv643xx_eth_probe

Cannot directly return platform_get_irq return irq, there
are operations that need to be undone.

Fixes: bf2b834 ("net: mv643xx_eth: use platform_get_irq() instead of platform_get_resource()")
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20220316012444.2126070-1-chi.minghao@zte.com.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/mv643xx_eth.c

@@ -3189,8 +3189,10 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
 
 
 	irq = platform_get_irq(pdev, 0);
-	if (WARN_ON(irq < 0))
-		return irq;
+	if (WARN_ON(irq < 0)) {
+		err = irq;
+		goto out;
+	}
 	dev->irq = irq;
 
 	dev->netdev_ops = &mv643xx_eth_netdev_ops;