net: filter: sk_chk_filter() no longer mangles filter
Add const attribute to filter argument to make clear it is no longer modified. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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