Draft: netfilter: Fix for warning in nf_tables_chain_destroy

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2232318 Upstream Status: All upstream in linus.git Tested: nftables shell testsuite, testcases/maps/vmap_timeout does not trigger kernel warning anyore.

Patch 4 probably fixes the reported warning. The commit it alegedly fixes is missing though, so backport this one as well in patch 1 - it in turn does fix an existing com mit, so shouldn't hurt. Patches 2 and 3 are dependencies to make patch 4 apply cleanly.

Signed-off-by: Phil Sutter psutter@redhat.com