staging: comedi: plx9080.h: remove unnecessary printk noise

The timeouts will return -ETIMEDOUT. The printks are just added noise.
Remove them.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>