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ndb/dns: dont override req->aborttime in udpquery()

overriding aborttime in udpquery() makes no sense. it causes
recursive queries to extend the timeout infinitely. nobody
but the issuer of the request should modify aborttime.

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

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

@@ -1404,7 +1404,6 @@

 		pcntprob = likely[qp->type];

 	reqtm = (patient? 2 * Maxreqtm: Maxreqtm);

 	wait = weight(reqtm / 3, pcntprob);	/* time for one udp query */

-	qp->req->aborttime = timems() + 3*wait; /* for all udp queries */

 	qp->udpfd = fd;

 	rv = queryns(qp, depth, ibuf, obuf, wait, inns);

-- 

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