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The large public DNS services seem not to return proof-of-nonexistence for DS records at the start of RFC-1918 in-addr.arpa domains and the their IPv6 equivalents. 10.in-addr.arpa, 168.192.in-addr.arpa etc. Since dnsmasq already has an option which instructs it not bother upstream servers with pointless queries about these address ranges, namely --bogus-priv, we extend that to enable behaviour which allows dnsmasq to assume that insecure NXDOMAIN replies for these domains are expected and to assume that the domains are legitimately unsigned. This behaviour only matters when some address range is directed to another upstream server using --rev-server. In that case it allows replies from that server to pass DNSSEC validation. Without such a server configured, queries are never sent upstream so they are never validated and the new behaviour is moot.