bpf: use skb_pkt_type_ok helper in bpf_skb_change_type
Since we have a skb_pkt_type_ok() helper for checking the type before mangling, make use of it instead of open coding. Follow-up to commit 8b10cab6 ("net: simplify and make pkt_type_ok() available for other users") that came in after d2485c42 ("bpf: add bpf_skb_change_type helper"). Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Acked-by: NAlexei Starovoitov <ast@kernel.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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