ntb_netdev: remove from list on exit

The ntb_netdev device is not removed from the global list of devices
upon device removal.  If the device is re-added, the removal code would
find the first instance and try to remove an already removed device.

Signed-off-by: Jon Mason <jon.mason@intel.com>
diff --git a/drivers/net/ntb_netdev.c b/drivers/net/ntb_netdev.c
index ed947dd..f3cdf64 100644
--- a/drivers/net/ntb_netdev.c
+++ b/drivers/net/ntb_netdev.c
@@ -375,6 +375,8 @@
 	if (dev == NULL)
 		return;
 
+	list_del(&dev->list);
+
 	ndev = dev->ndev;
 
 	unregister_netdev(ndev);