[RESEND PATCH 3/3] X25: Fix oops and refcnt problems from x25_dev_get

[andrew hendry]

Calls to x25_dev_get check for dev = NULL which was not set.
It allowed x25 to set routes and ioctls on down interfaces.
This caused oopses and refcnt problems on device_unregister.

Signed-off-by: Andrew Hendry <andrew.hendry@xxxxxxxxx>

--- a/net/x25/x25_route.c	2009-11-25 09:30:52.003038597 +1100
+++ b/net/x25/x25_route.c	2009-11-25 09:33:37.627093701 +1100
@@ -136,8 +136,10 @@ struct net_device *x25_dev_get(char *dev
 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 					&& dev->type != ARPHRD_ETHER
 #endif
-					)))
+					))) {
 		dev_put(dev);
+		dev = NULL;
+	}

 	return dev;
 }
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