nacl: fix build

TBR=r
CC=golang-dev
https://golang.org/cl/1706044

src/pkg/exp/nacl/av/av.go

@@ -157,7 +157,7 @@ func videoPollEvent(ev []byte) (err os.Error) {
 		if r == bridge.share.eq.wi {
 			return noEvents
 		}
-		copy(ev, &bridge.share.eq.event[r])
+		copy(ev, bridge.share.eq.event[r][0:])
 		bridge.share.eq.ri = (r + 1) % eqsize
 		return nil
 	}

src/pkg/exp/nacl/srpc/msg.go

@@ -120,7 +120,7 @@ func (r *msgReceiver) recv() (*msg, os.Error) {
 	// returned the total byte count as n.
 	m := new(msg)
 	m.rdata = make([]byte, n)
-	copy(m.rdata, &r.data)
+	copy(m.rdata, r.data[0:])
 
 	// Make a copy of the desc too.
 	// The system call *did* update r.hdr.ndesc.