rapidio: add check for rio_add_net() in rio_scan_alloc_net()

The return value of rio_add_net() should be checked.  If it fails,
put_device() should be called to free the memory and give up the reference
initialized in rio_add_net().

Link: https://lkml.kernel.org/r/[email protected]
Fixes: e6b585c ("rapidio: move net allocation into core code")
Signed-off-by: Yang Yingliang <[email protected]>
Signed-off-by: Haoxiang Li <[email protected]>
Cc: Alexandre Bounine <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Haoxiang Li

Diff for: drivers/rapidio/rio-scan.c

@@ -871,7 +871,10 @@ static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
 		dev_set_name(&net->dev, "rnet_%d", net->id);
 		net->dev.parent = &mport->dev;
 		net->dev.release = rio_scan_release_dev;
-		rio_add_net(net);
+		if (rio_add_net(net)) {
+			put_device(&net->dev);
+			net = NULL;
+		}
 	}
 
 	return net;