staging: comedi: usbduxfast: remove some unused defines

Now that the private data is kzalloc'ed when the device is attached,
the NUMUSBDUXFAST define is not used. Remove it.

The SUBDEV_AD define is only used when setting up the subdevice.
Remove it and just open-code the value.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/usbduxfast.c

@@ -115,16 +115,6 @@
  */
 #define NUMOFINBUFFERSHIGH	10
 
-/*
- * total number of usbduxfast devices
- */
-#define NUMUSBDUXFAST	16
-
-/*
- * analogue in subdevice
- */
-#define SUBDEV_AD	0
-
 /*
  * min delay steps for more than one channel
  * basically when the mux gives up ;-)
@@ -1295,7 +1285,7 @@ static int usbduxfast_attach_common(struct comedi_device *dev)
 	}
 
 	/* Analog Input subdevice */
-	s = &dev->subdevices[SUBDEV_AD];
+	s = &dev->subdevices[0];
 	dev->read_subdev = s;
 	s->type		= COMEDI_SUBD_AI;
 	s->subdev_flags	= SDF_READABLE | SDF_GROUND | SDF_CMD_READ;