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ndb/dnstcp: only lookup the expected address type in findserver()

theres no reason to lookup both A and AAAA records, as we already
know the type of srcip.

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

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

@@ -265,8 +265,8 @@

 				return servers;

 			continue;

 		}

-		list = dnresolve(servers->name, Cin, Ta, req, nil, 0, Recurse, 0, nil);

-		rrcat(&list, dnresolve(servers->name, Cin, Taaaa, req, nil, 0, Recurse, 0, nil));

+		list = dnresolve(servers->name, Cin, isv4(srcip)? Ta: Taaaa,

+			req, nil, 0, Recurse, 0, nil);

 		for(rp = list; rp != nil; rp = rp->next){

 			if(parseip(ip, rp->ip->name) == -1)

 				continue;

-- 

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