staging: comedi: ni_at_ao: replace comedi_board() calls

The `comedi_board(dev)` inline function calls just return
`dev->board_ptr`.  Expand the inline function calls.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_at_ao.c

@@ -319,7 +319,7 @@ static void atao_reset(struct comedi_device *dev)
 
 static int atao_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
-	const struct atao_board *board = comedi_board(dev);
+	const struct atao_board *board = dev->board_ptr;
 	struct atao_private *devpriv;
 	struct comedi_subdevice *s;
 	int ret;