[PATCH] hwmon: w83792d simplify in low bits handling

Simplify the way the w83792d driver handles the extra resolution
bits of voltage input channels.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Yuan Mu <Ymu@winbond.com.tw>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>