mfd: Use platform_get_irq() to get the interrupt

It is not recommened to use platform_get_resource(pdev, IORESOURCE_IRQ)
for requesting IRQ's resources any more, as they can be not ready yet in
case of DT-booting.

platform_get_irq() instead is a recommended way for getting IRQ even if
it was not retrieved earlier.

It also makes code simpler because we're getting "int" value right away
and no conversion from resource to int is required.

The print function dev_err() is redundant because platform_get_irq()
already prints an error.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@zte.com.cn>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220309035607.2080884-1-chi.minghao@zte.com.cn

Author: Minghao Chi (CGEL ZTE)

drivers/mfd/ab8500-core.c

@@ -1022,9 +1022,9 @@ static int ab8500_probe(struct platform_device *pdev)
 	enum ab8500_version version = AB8500_VERSION_UNDEFINED;
 	struct device_node *np = pdev->dev.of_node;
 	struct ab8500 *ab8500;
-	struct resource *resource;
 	int ret;
 	int i;
+	int irq;
 	u8 value;
 
 	ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
@@ -1033,13 +1033,11 @@ static int ab8500_probe(struct platform_device *pdev)
 
 	ab8500->dev = &pdev->dev;
 
-	resource = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!resource) {
-		dev_err(&pdev->dev, "no IRQ resource\n");
-		return -ENODEV;
-	}
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
-	ab8500->irq = resource->start;
+	ab8500->irq = irq;
 
 	ab8500->read = ab8500_prcmu_read;
 	ab8500->write = ab8500_prcmu_write;