try not to loop over all addresses

we're only using one at this point so restart loop if we found one

src/lib/asiolink/udpdns.cc

@@ -308,28 +308,32 @@ UDPQuery::operator()(error_code ec, size_t length) {
                 // this needs to tie into NSAS of course
                 // for this very first mockup, hope there is an
                 // address in additional and just use that
-                if (incoming.getRRCount(Message::SECTION_ADDITIONAL) > 0) {
-                    // send query to the first address
-                    for (RRsetIterator rrsi = incoming.beginSection(Message::SECTION_ADDITIONAL);
-                         rrsi != incoming.endSection(Message::SECTION_ADDITIONAL);
-                         rrsi++) {
-                        ConstRRsetPtr rrs = *rrsi;
-                        if (rrs->getType() == RRType::A()) {
-                            // found address
-                            RdataIteratorPtr rdi = rrs->getRdataIterator();
-                            // just use the first
-                            if (!rdi->isLast()) {
-                                std::string addr_str = rdi->getCurrent().toText();
-                                dlog("[XX] first address found: " + addr_str);
-                                // now we have one address, simply
-                                // resend that exact same query
-                                // to that address and yield, when it
-                                // returns, loop again.
-                                //ip::address addr = 
-                                data_->remote.address(ip::address::from_string(addr_str));
-                            }
+
+                // send query to the first address
+                bool found_address = false;
+                for (RRsetIterator rrsi = incoming.beginSection(Message::SECTION_ADDITIONAL);
+                     rrsi != incoming.endSection(Message::SECTION_ADDITIONAL) && !found_address;
+                     rrsi++) {
+                    ConstRRsetPtr rrs = *rrsi;
+                    if (rrs->getType() == RRType::A()) {
+                        // found address
+                        RdataIteratorPtr rdi = rrs->getRdataIterator();
+                        // just use the first
+                        if (!rdi->isLast()) {
+                            std::string addr_str = rdi->getCurrent().toText();
+                            dlog("[XX] first address found: " + addr_str);
+                            // now we have one address, simply
+                            // resend that exact same query
+                            // to that address and yield, when it
+                            // returns, loop again.
+                            //ip::address addr = 
+                            data_->remote.address(ip::address::from_string(addr_str));
+                            found_address = true;
                         }
                     }
+                }
+                if (found_address) {
+                    // restart loop
                 } else {
                     dlog("[XX] no ready-made addresses in additional. need nsas.");
                     // this will result in answering with the delegation. oh well