staging: comedi: dt3000: tidy up digital i/o subdevice init

Remove the unnecessary 'len_chanlist' initialization. This member is
only used by subdevices that support async commands.

For aesthetics, reorder the initialization a bit.
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>

drivers/staging/comedi/drivers/dt3000.c

@@ -694,16 +694,15 @@ static int dt3000_auto_attach(struct comedi_device *dev,
 		s->type		= COMEDI_SUBD_UNUSED;
 	}
 
+	/* Digital I/O subdevice */
 	s = &dev->subdevices[2];
-	/* dio subsystem */
 	s->type		= COMEDI_SUBD_DIO;
 	s->subdev_flags	= SDF_READABLE | SDF_WRITABLE;
 	s->n_chan	= 8;
-	s->insn_config	= dt3k_dio_insn_config;
-	s->insn_bits	= dt3k_dio_insn_bits;
 	s->maxdata	= 1;
-	s->len_chanlist	= 8;
 	s->range_table	= &range_digital;
+	s->insn_config	= dt3k_dio_insn_config;
+	s->insn_bits	= dt3k_dio_insn_bits;
 
 	s = &dev->subdevices[3];
 	/* mem subsystem */