spi: ppc4xx: Avoid returning 0 when failed to parse and map IRQ

0 is incorrect error code when failed to parse and map IRQ.
Replace OF specific old API for IRQ retrieval with a generic
one to fix this issue.

Fixes: 0f245463 ("spi: ppc4xx: handle irq_of_parse_and_map() errors")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20240814144525.2648450-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-ppc4xx.c

@@ -27,7 +27,6 @@
 #include <linux/wait.h>
 #include <linux/platform_device.h>
 #include <linux/of_address.h>
-#include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
@@ -412,9 +411,10 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
 	}
 
 	/* Request IRQ */
-	hw->irqnum = irq_of_parse_and_map(np, 0);
-	if (hw->irqnum <= 0)
+	ret = platform_get_irq(op, 0);
+	if (ret < 0)
 		goto free_host;
+	hw->irqnum = ret;
 
 	if (hw->irqnum <= 0)
 		goto free_host;