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Struct ctl_table_header holds pointer to sysctl table which could be used for freeing it after unregistration. IPv4 sysctls already use that. Remove redundant NULL assignment: ndev allocated using kzalloc. This also saves some bytes: sysctl table could be shorter than DEVCONF_MAX+1 if some options are disable in config. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: David S. Miller <davem@davemloft.net>