tun: Return -EINVAL if neither IFF_TUN nor IFF_TAP is set.
After commit 2b980dbd ("lsm: Add hooks to the TUN driver") tun_set_iff doesn't return -EINVAL though neither IFF_TUN nor IFF_TAP is set. Signed-off-by: NKusanagi Kouichi <slash@ma.neweb.ne.jp> Reviewed-by: NPaul Moore <paul.moore@hp.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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