bugfix update byte count total

dns.packer.js

@@ -97,7 +97,7 @@ var dnspack = exports.DNS_PACKER = {
           total += 1;
         });
       } else {
-        dnspack.packRdata(ab, dv, total, a);
+        total = dnspack.packRdata(ab, dv, total, a);
       }
     }