Input: mtk-pmic-keys - 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 in three places.
Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/mtk-pmic-keys.c

@@ -286,8 +286,10 @@ static int mtk_pmic_keys_probe(struct platform_device *pdev)
 		keys->keys[index].regs = &mtk_pmic_regs->keys_regs[index];
 
 		keys->keys[index].irq = platform_get_irq(pdev, index);
-		if (keys->keys[index].irq < 0)
+		if (keys->keys[index].irq < 0) {
+			of_node_put(child);
 			return keys->keys[index].irq;
+		}
 
 		error = of_property_read_u32(child,
 			"linux,keycodes", &keys->keys[index].keycode);
@@ -295,6 +297,7 @@ static int mtk_pmic_keys_probe(struct platform_device *pdev)
 			dev_err(keys->dev,
 				"failed to read key:%d linux,keycode property: %d\n",
 				index, error);
+			of_node_put(child);
 			return error;
 		}
 
@@ -302,8 +305,10 @@ static int mtk_pmic_keys_probe(struct platform_device *pdev)
 			keys->keys[index].wakeup = true;
 
 		error = mtk_pmic_key_setup(keys, &keys->keys[index]);
-		if (error)
+		if (error) {
+			of_node_put(child);
 			return error;
+		}
 
 		index++;
 	}