hrs 9b9f9167f5 Fix an issue of net.inet.igmp.stats handler.
The header of (struct igmpstat) could be cleared by sysctl(3).
This can be reproduced by "netstat -s -z -p igmp".

PR:	244584
MFC after:	1 week
2020-03-07 08:41:10 +00:00
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