leds: leds-gpio: Use of_get_child_count() helper

Use of_get_child_count() instead of custom implementation.

Signed-off-by: Tobias Klauser <klto@zhaw.ch>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index c392c1e..cde85ba 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -170,11 +170,10 @@
 {
 	struct device_node *np = pdev->dev.of_node, *child;
 	struct gpio_leds_priv *priv;
-	int count = 0, ret;
+	int count, ret;
 
 	/* count LEDs in this device, so we know how much to allocate */
-	for_each_child_of_node(np, child)
-		count++;
+	count = of_get_child_count(np);
 	if (!count)
 		return NULL;