ata: pata_ixp4xx: 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>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

drivers/ata/pata_ixp4xx_cf.c

@@ -274,12 +274,9 @@ static int ixp4xx_pata_probe(struct platform_device *pdev)
 		return PTR_ERR(ixpp->ctl);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq > 0)
-		irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
-	else if (irq < 0)
+	if (irq < 0)
 		return irq;
-	else
-		return -EINVAL;
+	irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
 
 	/* Just one port to set up */
 	ixp4xx_setup_port(ixpp->host->ports[0], ixpp, cmd->start, ctl->start);