hwmon: (ina3221) Add of_node_put() before return

Each iteration of for_each_child_of_node puts the previous
node, but in the case of a return from the middle of the loop, there is
no put, thus causing a memory leak. Hence add an of_node_put before the
return.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190706132130.3129-1-nishkadg.linux@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/ina3221.c

@@ -713,8 +713,10 @@ static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina)
 
 	for_each_child_of_node(np, child) {
 		ret = ina3221_probe_child_from_dt(dev, child, ina);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 	}
 
 	return 0;