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ndb/dns: give each DoT server Maxtcpdialtm + 500ms to complete request

--- a/sys/src/cmd/ndb/dnresolve.c

+++ b/sys/src/cmd/ndb/dnresolve.c

@@ -1312,8 +1312,10 @@

 	n = 0;

 	n = serveraddrs(qp, dest, n, Ta);

 	n = serveraddrs(qp, dest, n, Taaaa);

-	endms = nowms + 500;

 	for(p = dest; p < dest+n; p++){

+		endms = timems() + Maxtcpdialtm + 500;

+		if(endms > qp->req->aborttime)

+			endms = qp->req->aborttime;

 		if(tcpquery(qp, pkt, len, p, endms, &m, 1) == 0){

 			/* free or incorporate RRs in m */

 			rv = procansw(qp, p, &m);