power: supply: mp2629_charger: use platform_get_irq()

Calling platform_get_irq_optional() doesn't make sense if you then bail out
on any error it returns.  Switch to calling platform_get_irq() instead and
remove dev_err() call as platform_get_irq() already curses loudly on error.
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/mp2629_charger.c

@@ -580,11 +580,9 @@ static int mp2629_charger_probe(struct platform_device *pdev)
 	charger->dev = dev;
 	platform_set_drvdata(pdev, charger);
 
-	irq = platform_get_irq_optional(to_platform_device(dev->parent), 0);
-	if (irq < 0) {
-		dev_err(dev, "get irq fail: %d\n", irq);
+	irq = platform_get_irq(to_platform_device(dev->parent), 0);
+	if (irq < 0)
 		return irq;
-	}
 
 	for (i = 0; i < MP2629_MAX_FIELD; i++) {
 		charger->regmap_fields[i] = devm_regmap_field_alloc(dev,