https://bugzilla.netfilter.org/show_bug.cgi?id=1351
nft -f <<EOF
flush ruleset
table inet filter {
}
table inet filter {
chain test {
counter
}
}
EOF
segfaults during error reporting.
First patch makes error handling more robust.
Second patch passes the right handle -- with above ruleset this
highlights "chain test" in the resulting error message.
Last patch skips rule cache updates for invalid op to restore
the 0.9.0 behaviour.
