Once again a (small) patch for the phidgetservo driver.

Some servos have a very high maximum angle, set upper limit to the
maximum allowed by the hardware. Reported by Mario Scholz
<mario@expires-0409.mail.trial-n-error.net>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>