hwmon: fscher read control bugfix

Here is a small fscher bugfix for 2.6.23 merging, lifted from my other fscher
work, as requested by Jean. The current driver has a control sysfs attribute,
which shows the contents of the control register, but the underlying
global_control value in the data structure currently never gets filled with
the actual contents of this register.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>