staging: unisys: prevent faults in visornic_pause

Prevent faults in visornic_pause, visornic_resume(), and visornic_remove()

Prior to this patch, any call to visornic_pause(), visornic_resume(), or
visornic_remove() would fault, due to dev_set_drvdata() never having been
called to stash our struct visornic_devdata * into the device's drvdata.
I.e., all calls to dev_get_drvdata() were returning NULL, meaning a fault
was soon to follow.
Signed-off-by: Tim Sell <Timothy.Sell@unisys.com>
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visornic/visornic_main.c

@@ -1831,6 +1831,7 @@ static int visornic_probe(struct visor_device *dev)
 	}
 
 	devdata->netdev = netdev;
+	dev_set_drvdata(&dev->device, devdata);
 	init_waitqueue_head(&devdata->rsp_queue);
 	spin_lock_init(&devdata->priv_lock);
 	devdata->enabled = 0; /* not yet */