Staging: samsung-laptop: fix up my fixup for some sysfs attribute permissions

They should be writable by root, not readable.
Doh, stupid me with the wrong flags.

Reported-by: Jonathan Cameron <[e-mail]>
Cc: stable <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/samsung-laptop/samsung-laptop.c

···
 	}
 	return count;
 }
-static DEVICE_ATTR(silent, S_IRUSR | S_IRUGO,
+static DEVICE_ATTR(silent, S_IWUSR | S_IRUGO,
 		   get_silent_state, set_silent_state);