Input: sun4i-lradc-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/sun4i-lradc-keys.c

@@ -207,18 +207,21 @@ static int sun4i_lradc_load_dt_keymap(struct device *dev,
 		error = of_property_read_u32(pp, "channel", &channel);
 		if (error || channel != 0) {
 			dev_err(dev, "%pOFn: Inval channel prop\n", pp);
+			of_node_put(pp);
 			return -EINVAL;
 		}
 
 		error = of_property_read_u32(pp, "voltage", &map->voltage);
 		if (error) {
 			dev_err(dev, "%pOFn: Inval voltage prop\n", pp);
+			of_node_put(pp);
 			return -EINVAL;
 		}
 
 		error = of_property_read_u32(pp, "linux,code", &map->keycode);
 		if (error) {
 			dev_err(dev, "%pOFn: Inval linux,code prop\n", pp);
+			of_node_put(pp);
 			return -EINVAL;
 		}