leds: lm355x: Fix up world writable sysfs file

We don't need the sysfs file to be world writable or group writable.
This file is write-only, change it to S_IWUSR (0200).

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: G.Shark Jeong <gshark.jeong@gmail.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

drivers/leds/leds-lm355x.c

@@ -411,7 +411,7 @@ out:
 	return ret;
 }
 
-static DEVICE_ATTR(pattern, 0666, NULL, lm3556_indicator_pattern_store);
+static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
 
 static const struct regmap_config lm355x_regmap = {
 	.reg_bits = 8,