Coverity Scan issues after DNSRPS test library integration

With the DNSRPS test library integrated (!7693 (merged)) Coverity Scan reported two issues.

*** CID 451099:    (RESOURCE_LEAK)
/lib/dns/include/dns/librpz.h: 918 in librpz_lib_open()
912     	}
913     	new_librpz = dlsym(handle, LIBRPZ_DEF_STR);
914     	if (new_librpz != NULL) {
915     		if (dl_handle != NULL) {
916     			*dl_handle = handle;
917     		}
>>>     CID 451099:    (RESOURCE_LEAK)
>>>     Variable "handle" going out of scope leaks the storage it points to.
918     		return (new_librpz);
919     	}
920     	snprintf(emsg->c, sizeof(librpz_emsg_t),
921     		 "dlsym(%s, " LIBRPZ_DEF_STR "): %s", path, dlerror());
922     	dlclose(handle);
923     	return (NULL);
/lib/dns/include/dns/librpz.h: 891 in librpz_lib_open()
885     	if (handle != NULL) {
886     		new_librpz = dlsym(handle, LIBRPZ_DEF_STR);
887     		if (new_librpz != NULL) {
888     			if (dl_handle != NULL) {
889     				*dl_handle = handle;
890     			}
>>>     CID 451099:    (RESOURCE_LEAK)
>>>     Variable "handle" going out of scope leaks the storage it points to.
891     			return (new_librpz);
892     		}
893     		if (dlclose(handle) != 0) {
894     			snprintf(emsg->c, sizeof(librpz_emsg_t),
895     				 "dlsym(NULL, " LIBRPZ_DEF_STR "): %s",
896     				 dlerror());

*** CID 451096:  Error handling issues  (CHECKED_RETURN)
/lib/ns/query.c: 3442 in dnsrps_set_p()
3436     		return (false);
3437     	}
3438     	region.base = pname_buf.d;
3439     	region.length = pname_buf.size;
3440     	dns_name_fromregion(st->p_name, &region);
3441     
>>>     CID 451096:  Error handling issues  (CHECKED_RETURN)
>>>     Calling "rpz_ready" without checking return value (as is done elsewhere 4 out of 5 times).
3442     	rpz_ready(client, p_rdatasetp);
3443     	dns_db_attach(st->rpsdb, &p_db);
3444     	policy = dns_dnsrps_2policy(rpsdb->result.policy);
3445     	if (policy != DNS_RPZ_POLICY_RECORD) {
3446     		result = ISC_R_SUCCESS;
3447     	} else if (qtype == dns_rdatatype_rrsig) {