Fixed a segfault in nidio_detach() when configure fails because it can't

find board

diff --git a/comedi/drivers/ni_pcidio.c b/comedi/drivers/ni_pcidio.c
index bb6620c2023caeaf542558f9d7b8d5ac7764e375..603d970cd43b419ca77f1c2562ea4592742f19fb 100644 (file)
--- a/comedi/drivers/ni_pcidio.c
+++ b/comedi/drivers/ni_pcidio.c
@@ -499,7 +499,7 @@ static int nidio_detach(comedi_device *dev)
 {
        int i;
 
-       if(!this_board->is_diodaq){
+       if(this_board && !this_board->is_diodaq){
                for(i=0;i<this_board->n_8255;i++){
                        subdev_8255_cleanup(dev,dev->subdevices+i);
                }