staging: comedi: das1800: tidy up digital input 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

@@ -1130,10 +1130,10 @@ static int das1800_ao_winsn(struct comedi_device *dev,
 	return 1;
 }
 
-/* reads from digital input channels */
-static int das1800_di_rbits(struct comedi_device *dev,
+static int das1800_di_insn_bits(struct comedi_device *dev,
 				struct comedi_subdevice *s,
-			    struct comedi_insn *insn, unsigned int *data)
+				struct comedi_insn *insn,
+				unsigned int *data)
 {
 	data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
 	data[0] = 0;
@@ -1387,14 +1387,14 @@ static int das1800_attach(struct comedi_device *dev,
 		s->type = COMEDI_SUBD_UNUSED;
 	}
 
-	/* di */
+	/* Digital Input subdevice */
 	s = &dev->subdevices[2];
 	s->type		= COMEDI_SUBD_DI;
 	s->subdev_flags	= SDF_READABLE;
 	s->n_chan	= 4;
 	s->maxdata	= 1;
 	s->range_table	= &range_digital;
-	s->insn_bits = das1800_di_rbits;
+	s->insn_bits	= das1800_di_insn_bits;
 
 	/* Digital Output subdevice */
 	s = &dev->subdevices[3];