mfd: max77620: 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.
Issue found with Coccinelle.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/max77620.c

@@ -416,8 +416,10 @@ static int max77620_initialise_fps(struct max77620_chip *chip)
 
 	for_each_child_of_node(fps_np, fps_child) {
 		ret = max77620_config_fps(chip, fps_child);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(fps_child);
 			return ret;
+		}
 	}
 
 	config = chip->enable_global_lpm ? MAX77620_ONOFFCNFG2_SLP_LPM_MSK : 0;