Setting negative fan multiplier or maximal fan speed does make any sense and
can cause problems. So ensure that negative values will not be accepted.
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>