[PATCH] abituguru: Fix fan detection

One of my testers had a problem where the driver only saw 2 of the 4 fan
sensors his uGuru has, this fixes this.
 -accept 0x40 (bit 6) being high as a valid fan sensor setting for all fans
  not just fan 1, I have a feeling this bit indicates whether or not a fan is
  actually connected .

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>