staging: comedi: c6xdigio: tidy up subdevice 1 init

Remove the commented out init of the 'trig'.

For aesthetics, add some whitespace to the init and rename the 'insn_read'
function.

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>