staging: comedi: remove thisboard macro in the ssv_dnp driver

The 'thisboard' macro depends on having a local variable with
a magic name. The CodingStyle document suggests not doing this
to avoid confusion. Remove the macro and use the comedi_board()
inline helper to get the dev->board_ptr information.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ssv_dnp.c

@@ -59,9 +59,6 @@ struct dnp_board {
 	int have_dio;
 };
 
-/* Useful for shorthand access to the particular board structure ----------- */
-#define thisboard ((const struct dnp_board *)dev->board_ptr)
-
 /* This structure is for data unique to the DNP driver --------------------- */
 struct dnp_private_data {
 
@@ -188,18 +185,12 @@ static int dnp_dio_insn_config(struct comedi_device *dev,
 
 static int dnp_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
+	const struct dnp_board *board = comedi_board(dev);
 	struct comedi_subdevice *s;
 
 	printk(KERN_INFO "comedi%d: dnp: ", dev->minor);
 
-	/* Autoprobing: this should find out which board we have. Currently  */
-	/* only the 1486 board is supported and autoprobing is not           */
-	/* implemented :-)                                                   */
-	/* dev->board_ptr = dnp_probe(dev); */
-
-	/* Initialize the name of the board.                                 */
-	/* We can use the "thisboard" macro now.                             */
-	dev->board_name = thisboard->name;
+	dev->board_name = board->name;
 
 	/* Allocate the private structure area. alloc_private() is a         */
 	/* convenient macro defined in comedidev.h.                          */