ipv4: register igmp_notifier even when !CONFIG_PROC_FS
We still need this notifier even when we don't config PROC_FS. It should be rare to have a kernel without PROC_FS, so just for completeness. Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: David S. Miller <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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