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ndb/dns: use same buffer size of udp packet in redistrib() as dnudpserver() (fixes assert)

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

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

@@ -102,9 +102,9 @@

 static void

 redistrib(uchar *buf, int len)

 {

+	static uchar outpkt[Udphdrsize + Maxudp + 1024];

 	Forwtarg *tp;

 	Udphdr *uh;

-	static uchar outpkt[1500];

 	assert(len <= sizeof outpkt);

 	memmove(outpkt, buf, len);