staging: comedi: pcl816: use cfc_bytes_per_scan()

Use the comedi_fc helper to get the number of bytes per scan.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: NIan Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/pcl816.c

@@ -164,7 +164,7 @@ static void pcl816_ai_setup_dma(struct comedi_device *dev,
 	bytes = devpriv->hwdmasize;
 	if (cmd->stop_src == TRIG_COUNT) {
 		/*  how many */
-		bytes = cmd->stop_arg * cmd->chanlist_len * sizeof(short);
+		bytes = cmd->stop_arg * cfc_bytes_per_scan(s);
 
 		/*  how many DMA pages we must fill */
 		devpriv->dma_runs_to_end = bytes / devpriv->hwdmasize;