We forget to release the reference of tun device in tun_recvmsg.
bug introduced in commit 54f968d6
(tuntap: move socket to tun_file)
Signed-off-by: NGao feng <gaofeng@cn.fujitsu.com>
Acked-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>