Cleanup / temp buffers for various things

peer/app_test.go

@@ -52,6 +52,7 @@ func newTestApp(t *testing.T, vpnIP string, isPublic, isRelay bool) (*App, *fake
 		controlConn: cc,
 		peersByKey:  make(map[wgtypes.Key]*Peer),
 		peersByIP:   make(map[netip.Addr]*Peer),
+		scratch:     make([]byte, scratchSize),
 		hubAddCh:    make(chan m.Peer),
 		hubRemoveCh: make(chan wgtypes.Key),
 		pingCh:      make(chan PingEvent),