staging: comedi: pcl812: missing break statement

Smatch complains that there is a missing break statement here.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/pcl812.c

@@ -1404,6 +1404,7 @@ static int pcl812_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 		if (it->options[3] > 0)
 						/*  we use external trigger */
 			devpriv->use_ext_trg = 1;
+		break;
 	case boardA821:
 		devpriv->max_812_ai_mode0_rangewait = 1;
 		devpriv->mode_reg_int = (irq << 4) & 0xf0;