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arp: don't leak data in the padding of arp replies

--- a/sys/src/9/ip/ethermedium.c

+++ b/sys/src/9/ip/ethermedium.c

@@ -586,7 +586,7 @@

 			n = ifc->mintu;

 		rbp = allocb(n);

 		r = (Etherarp*)rbp->rp;

-		memset(r, 0, sizeof(Etherarp));

+		memset(r, 0, n);

 		hnputs(r->type, ETARP);

 		hnputs(r->hrd, 1);

 		hnputs(r->pro, ETIP4);