Auto-port 4.1: IpFilter: Fix ClassCastException caused by IpSubnetFilter if only ipv6 rules are configured but remote peer is using ipv4#16822
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Auto-port of #16803 to 4.1
Cherry-picked commit: 0ccb265
Motivation:
We did miss an instanceof check which could cause a CCE.
Modifications:
Result:
No more ClassCastException