[RTNETLINK]: Fix use of wrong skb in do_getlink()

skb is the netlink query, nskb is the reply message.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 221e403..02f3c79 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -602,7 +602,7 @@
 		goto errout;
 	}
 
-	err = rtnl_unicast(skb, NETLINK_CB(skb).pid);
+	err = rtnl_unicast(nskb, NETLINK_CB(skb).pid);
 errout:
 	kfree(iw_buf);
 	dev_put(dev);