staging: comedi: dmm32at: remove unnecessary printk noise

A timeout 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>