Fix back port issues: missing checks.
** CID 312923: Error handling issues (CHECKED_RETURN)
/lib/dns/zone.c: 11660 in create_query()
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*** CID 312923: Error handling issues (CHECKED_RETURN)
/lib/dns/zone.c: 11660 in create_query()
11654 dns_message_t **messagep) {
11655 dns_message_t *message = NULL;
11656 dns_name_t *qname = NULL;
11657 dns_rdataset_t *qrdataset = NULL;
11658 isc_result_t result;
11659
CID 312923: Error handling issues (CHECKED_RETURN)
Calling "dns_message_create" without checking return value (as is done elsewhere 17 out of 21 times).
11660 dns_message_create(zone->mctx, DNS_MESSAGE_INTENTRENDER, &message);
11661
11662 message->opcode = dns_opcode_query;
11663 message->rdclass = zone->rdclass;
11664
11665 result = dns_message_gettempname(message, &qname);
** CID 312922: Error handling issues (CHECKED_RETURN)
/lib/dns/zone.c: 11994 in stub_request_nameserver_address()
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*** CID 312922: Error handling issues (CHECKED_RETURN)
/lib/dns/zone.c: 11994 in stub_request_nameserver_address()
11988 zone = args->stub->zone;
11989 request = isc_mem_get(zone->mctx, sizeof(*request));
11990 request->request = NULL;
11991 request->args = args;
11992 request->name = (dns_name_t)DNS_NAME_INITEMPTY;
11993 request->ipv4 = ipv4;
CID 312922: Error handling issues (CHECKED_RETURN)
Calling "dns_name_dup" without checking return value (as is done elsewhere 52 out of 60 times).
11994 dns_name_dup(name, zone->mctx, &request->name);
11995
11996 result = create_query(zone, ipv4 ? dns_rdatatype_a : dns_rdatatype_aaaa,
11997 &request->name, &message);
11998 INSIST(result == ISC_R_SUCCESS);
11999
