staging: comedi: ni_660x: fix missing break in switch statement

commit 479826cc86118e0d87e5cefb3df5b748e0480924 upstream.

Add missing break statement in order to prevent the code from falling
through to the default case and return -EINVAL every time.

This bug was found thanks to the ongoing efforts to enable
-Wimplicit-fallthrough.

Fixes: aa94f288 ("staging: comedi: ni_660x: tidy up ni_660x_set_pfi_routing()")
Cc: stable@vger.kernel.org
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: NIan Abbott <abbotti@mev.co.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ni_660x.c

@@ -602,6 +602,7 @@ static int ni_660x_set_pfi_routing(struct comedi_device *dev,
 	case NI_660X_PFI_OUTPUT_DIO:
 		if (chan > 31)
 			return -EINVAL;
+		break;
 	default:
 		return -EINVAL;
 	}