gpio: sysfs: fix memory leak in gpiod_sysfs_set_active_low

commit 49d2ca84e433dab854c7a866bc6add09cfab682d upstream.

Fix memory leak in the gpio sysfs interface due to failure to drop
reference to device returned by class_find_device when setting the
gpio-line polarity.

Fixes: 0769746 ("gpiolib: add support for changing value polarity in sysfs")
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: franciscofranco <[email protected]>

drivers/gpio/gpiolib.c

@@ -924,7 +924,7 @@ static int gpiod_sysfs_set_active_low(struct gpio_desc *desc, int value)
 	}
 
 	status = sysfs_set_active_low(desc, dev, value);
-
+	put_device(dev);
 unlock:
 	mutex_unlock(&sysfs_lock);