tun: add a missing rcu_read_unlock() in error path
In my latest patch I missed one rcu_read_unlock(), in case device is down. Fixes: 4477138f ("tun: properly test for IFF_UP") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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