staging: comedi: ni_660x: add a comment about the initial DIO state

The (*auto_attach) initializes all the DIO channels to a default state.
Add a comment for clarity.

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