leds: ncp5623: Use fwnode_get_child_node_count()

Since fwnode_get_child_node_count() was split from its device property
counterpart, we may utilise it in the driver and drop custom implementation.

Signed-off-by: Andy Shevchenko <[e-mail]>
Reviewed-by: Jonathan Cameron <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/leds/rgb/leds-ncp5623.c

···
 	struct device *dev = &client->dev;
 	struct fwnode_handle *mc_node, *led_node;
 	struct led_init_data init_data = { };
-	int num_subleds = 0;
 	struct ncp5623 *ncp;
 	struct mc_subled *subled_info;
+	unsigned int num_subleds;
 	u32 color_index;
 	u32 reg;
 	int ret;
···
 	if (!mc_node)
 		return -EINVAL;
 
-	fwnode_for_each_child_node(mc_node, led_node)
-		num_subleds++;
+	num_subleds = fwnode_get_child_node_count(mc_node);
 
 	subled_info = devm_kcalloc(dev, num_subleds, sizeof(*subled_info), GFP_KERNEL);
 	if (!subled_info) {