CVE-2024-41043 netfilter: nfnetlink_queue: drop bogus WARN_ON

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlinkqueue: drop bogus WARNON Happens when rules get flushed/deleted while packet is out, so remove this WARNON. This WARN exists in one form or another since v4.14, no need to backport this to older releases, henc...