staging: comedi: usbdux: remove unused define

This define is not used, and it's actually incorrect. The usbdux device
only has 4 analog output channels.

Remove it.

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>
1 file changed