pinctrl: freescale: imx: Add of_node_put() before return

Each iteration of for_each_child_of_node() puts the previous node;
however, in the case of a return from the middle of the loop, there is no
put, thus causing a memory leak. Hence put of_node_put() statements as
required before two mid-loop return statements.
Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190808074720.15754-1-nishkadg.linux@gmail.comReviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/pinctrl-imx.c

@@ -672,8 +672,10 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
 
 		grp = devm_kzalloc(ipctl->dev, sizeof(struct group_desc),
 				   GFP_KERNEL);
-		if (!grp)
+		if (!grp) {
+			of_node_put(child);
 			return -ENOMEM;
+		}
 
 		mutex_lock(&ipctl->mutex);
 		radix_tree_insert(&pctl->pin_group_tree,
@@ -697,14 +699,19 @@ static bool imx_pinctrl_dt_is_flat_functions(struct device_node *np)
 	struct device_node *pinctrl_np;
 
 	for_each_child_of_node(np, function_np) {
-		if (of_property_read_bool(function_np, "fsl,pins"))
+		if (of_property_read_bool(function_np, "fsl,pins")) {
+			of_node_put(function_np);
 			return true;
+		}
 
 		for_each_child_of_node(function_np, pinctrl_np) {
-			if (of_property_read_bool(pinctrl_np, "fsl,pins"))
+			if (of_property_read_bool(pinctrl_np, "fsl,pins")) {
+				of_node_put(pinctrl_np);
+				of_node_put(function_np);
 				return false;
 			}
 		}
+	}
 
 	return true;
 }