tun: relax check on eth_get_headlen() return value
syzkaller hit the WARN() in tun_get_user(), providing skb with payload in fragments only, and nothing in skb->head GRO layer is fine with this, so relax the check. Fixes: 90e33d45 ("tun: enable napi_gro_frags() for TUN/TAP driver") Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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