HID: playstation: fix return from dualsense_player_led_set_brightness()

brightness_set_blocking() callback expects function returning int. This fixes
the follwoing build failure:

drivers/hid/hid-playstation.c: In function ‘dualsense_player_led_set_brightness’:
drivers/hid/hid-playstation.c:885:1: error: no return statement in function returning non-void [-Werror=return-type]
 }
 ^
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-playstation.c

@@ -882,6 +882,8 @@ static int dualsense_player_led_set_brightness(struct led_classdev *led, enum le
 	spin_unlock_irqrestore(&ds->base.lock, flags);
 
 	schedule_work(&ds->output_worker);
+
+	return 0;
 }
 
 static void dualsense_init_output_report(struct dualsense *ds, struct dualsense_output_report *rp,