staging: comedi: das1800: tidy up digital output subdevice init

For aesthetics, add some whitespace to the subdevice init and rename
the (*insn_bits) 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>

drivers/staging/comedi/drivers/das1800.c

@@ -1141,7 +1141,7 @@ static int das1800_di_rbits(struct comedi_device *dev,
 	return insn->n;
 }
 
-static int das1800_do_wbits(struct comedi_device *dev,
+static int das1800_do_insn_bits(struct comedi_device *dev,
 				struct comedi_subdevice *s,
 				struct comedi_insn *insn,
 				unsigned int *data)
@@ -1396,14 +1396,14 @@ static int das1800_attach(struct comedi_device *dev,
 	s->range_table = &range_digital;
 	s->insn_bits = das1800_di_rbits;
 
-	/* do */
+	/* Digital Output subdevice */
 	s = &dev->subdevices[3];
 	s->type		= COMEDI_SUBD_DO;
 	s->subdev_flags	= SDF_WRITABLE;
 	s->n_chan	= board->do_n_chan;
 	s->maxdata	= 1;
 	s->range_table	= &range_digital;
-	s->insn_bits = das1800_do_wbits;
+	s->insn_bits	= das1800_do_insn_bits;
 
 	das1800_cancel(dev, dev->read_subdev);