Staging: comedi: pcl726: fixed a spelling mistake

Fixed a spelling mistake issue
Signed-off-by: Lokesh Chebrolu <lokeshch007@gmail.com>
Link: https://lore.kernel.org/r/1596784806-7130-1-git-send-email-lokeshch007@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/pcl726.c

@@ -389,7 +389,7 @@ static int pcl726_attach(struct comedi_device *dev,
 	}
 
 	if (dev->irq) {
-		/* Digial Input subdevice - Interrupt support */
+		/* Digital Input subdevice - Interrupt support */
 		s = &dev->subdevices[subdev++];
 		dev->read_subdev = s;
 		s->type		= COMEDI_SUBD_DI;