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ndb/dns: handle empty $DNSSERVER

when $DNSSERVER is empty, query ndb for local dns servers
instead of not using any at all.

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

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

@@ -937,11 +937,9 @@

 		return nsrp;

 	p = getenv("DNSSERVER");		/* list of ip addresses */

-	if(p != nil){

-		n = tokenize(p, args, nelem(args));

+	if(p != nil && (n = tokenize(p, args, nelem(args))) > 0){

 		for(i = 0; i < n; i++)

 			addlocaldnsserver(dp, class, args[i], i);

-		free(p);

 	} else {

 		t = lookupinfo("@dns");		/* @dns=ip1 @dns=ip2 ... */

 		if(t == nil)

@@ -953,6 +951,7 @@

 		}

 		ndbfree(t);

 	}

+	free(p);

 	return rrlookup(dp, Tns, NOneg);

 }

-- 

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