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>
 static unsigned short rtd_convert_chan_gain(struct comedi_device *dev,
                                            unsigned int chanspec, int index)
 {
-       const struct rtd_boardinfo *board = comedi_board(dev);
+       const struct rtd_boardinfo *board = dev->board_ptr;
        struct rtd_private *devpriv = dev->private;
        unsigned int chan = CR_CHAN(chanspec);
        unsigned int range = CR_RANGE(chanspec);