xfrm: delete not used number of external headers
num_exthdrs is set but never used, so delete it. Reviewed-by: Raed Salem <raeds@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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