cpufreq: dt: eliminate uses of of_node_put()

Make use of the __free() cleanup handler to automatically free nodes
when they get out of scope.

Only find_supply_name() is affected, and the new mechanism removes the
need for a 'goto' and the 'name' local variable.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/cpufreq-dt.c

@@ -68,12 +68,9 @@ static int set_target(struct cpufreq_policy *policy, unsigned int index)
  */
 static const char *find_supply_name(struct device *dev)
 {
-	struct device_node *np;
+	struct device_node *np __free(device_node) = of_node_get(dev->of_node);
 	struct property *pp;
 	int cpu = dev->id;
-	const char *name = NULL;
-
-	np = of_node_get(dev->of_node);
 
 	/* This must be valid for sure */
 	if (WARN_ON(!np))
@@ -82,22 +79,16 @@ static const char *find_supply_name(struct device *dev)
 	/* Try "cpu0" for older DTs */
 	if (!cpu) {
 		pp = of_find_property(np, "cpu0-supply", NULL);
-		if (pp) {
-			name = "cpu0";
-			goto node_put;
-		}
+		if (pp)
+			return "cpu0";
 	}
 
 	pp = of_find_property(np, "cpu-supply", NULL);
-	if (pp) {
-		name = "cpu";
-		goto node_put;
-	}
+	if (pp)
+		return "cpu";
 
 	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
-node_put:
-	of_node_put(np);
-	return name;
+	return NULL;
 }
 
 static int cpufreq_init(struct cpufreq_policy *policy)