In the -mm tree the rules for access an nsproxy have changed,
and in get_net_ns_by_pid we access the nsproxy, so update
it to follow the new rules.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 739fbad..1caba10 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -746,10 +746,10 @@ static struct net *get_net_ns_by_pid(pid_t pid)
 	rcu_read_lock();
 	tsk = find_task_by_pid(pid);
 	if (tsk) {
-		task_lock(tsk);
-		if (tsk->nsproxy)
-			net = get_net(tsk->nsproxy->net_ns);
-		task_unlock(tsk);
+		struct nsproxy *nsproxy;
+		nsproxy = task_nsproxy(tsk);
+		if (nsproxy)
+			net = get_net(nsproxy->net_ns);
 	}
 	rcu_read_unlock();
 	return net;
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