staging: comedi: ni_65xx: 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_65xx.c

@@ -294,7 +294,7 @@ MODULE_PARM_DESC(legacy_invert_outputs,
 
 static unsigned int ni_65xx_num_ports(struct comedi_device *dev)
 {
-	const struct ni_65xx_board *board = comedi_board(dev);
+	const struct ni_65xx_board *board = dev->board_ptr;
 
 	return board->num_dio_ports + board->num_di_ports + board->num_do_ports;
 }