[NET]: Relax the reference counting of init_net_ns
When the CONFIG_NET_NS is n there's no need in refcounting the initial net namespace. So relax this code by making a stupid stubs for the "n" case. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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