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ndb/dns: make sure theres only a single Topt option in getednsopt().

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

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

@@ -502,14 +502,21 @@

 RR*

 getednsopt(DNSmsg *mp)

 {

-	RR *rp;

+	RR *rp, *x;

 	rp = rrremtype(&mp->ar, Topt);

 	if(rp == nil)

 		return nil;

 	mp->arcount--;

+	while((x = rp->next) != nil){

+		rp->next = x->next;

+		rrfree(x);

+		mp->arcount--;

+	}

+

 	if(rp->udpsize < 512)

 		rp->udpsize = 512;

+

 	return rp;

 }