pinctrl: th1520: Convert dt child node loop to scoped iterator

Convert th1520_pinctrl_dt_node_to_map() to use a scoped iterator with
for_each_available_child_of_node_scoped(). As a result, there is no need
to call of_node_put() anymore. The put_child label has been renamed to
free_map which is now a more accurate description.

Suggested-by: Linus Walleij <[e-mail]>
Signed-off-by: Drew Fustini <[e-mail]>
Link: https://lore.kernel.org/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinctrl-th1520.c

···
 					 unsigned int *num_maps)
 {
 	struct th1520_pinctrl *thp = pinctrl_dev_get_drvdata(pctldev);
-	struct device_node *child;
 	struct pinctrl_map *map;
 	unsigned long *configs;
 	unsigned int nconfigs;
···
 	int ret;
 
 	nmaps = 0;
-	for_each_available_child_of_node(np, child) {
+	for_each_available_child_of_node_scoped(np, child) {
 		int npins = of_property_count_strings(child, "pins");
 
 		if (npins <= 0) {
-			of_node_put(child);
 			dev_err(thp->pctl->dev, "no pins selected for %pOFn.%pOFn\n",
 				np, child);
 			return -EINVAL;
···
 
 	nmaps = 0;
 	guard(mutex)(&thp->mutex);
-	for_each_available_child_of_node(np, child) {
+	for_each_available_child_of_node_scoped(np, child) {
 		unsigned int rollback = nmaps;
 		enum th1520_muxtype muxtype;
 		struct property *prop;
···
 		if (ret) {
 			dev_err(thp->pctl->dev, "%pOFn.%pOFn: error parsing pin config\n",
 				np, child);
-			goto put_child;
+			goto free_map;
 		}
 
 		if (!of_property_read_string(child, "function", &funcname)) {
···
 							  npins, (void *)muxtype);
 			if (ret < 0) {
 				dev_err(thp->pctl->dev, "error adding function %s\n", funcname);
-				goto put_child;
+				goto free_map;
 			}
 		}
 	}
···
 
 free_configs:
 	kfree(configs);
-put_child:
-	of_node_put(child);
+free_map:
 	th1520_pinctrl_dt_free_map(pctldev, map, nmaps);
 	return ret;
 }