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arp: interface address only specifies the interface, not the source address for route lookup

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

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

@@ -401,7 +401,7 @@

 		if((ifc = findipifc(fs, ia, ia, Runi)) == nil)

 			error("no interface");

 		rlock(ifc);

-		if(arpenter(fs, V6, ip, mac, n, ia, ifc, 0) < 0){

+		if(!ipv6local(ifc, ia, ip) || arpenter(fs, V6, ip, mac, n, ia, ifc, 0) < 0){

 			runlock(ifc);

 			error("destination unreachable");

 		}