ata: sata_rcar: Remove unnecessary return value check

As commit ce753ad1 ("platform: finally disallow IRQ0 in
platform_get_irq() and its ilk") says, there is no need to
check if the platform_get_irq return value is 0. Let's remove it.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

drivers/ata/sata_rcar.c

@@ -867,8 +867,6 @@ static int sata_rcar_probe(struct platform_device *pdev)
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
-	if (!irq)
-		return -EINVAL;
 
 	priv = devm_kzalloc(dev, sizeof(struct sata_rcar_priv), GFP_KERNEL);
 	if (!priv)