hwmon: (mcp3021) replace S_IRUGO with 0444

Replace S_IRUGO with the better readable 0444.
This fixes a checkpatch warning.

Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
1 file changed