fix test break

transport/internet/tcp/sockopt_linux.go

@@ -26,13 +26,17 @@ func GetOriginalDestination(conn internet.Connection) (v2net.Destination, error)
 		addr, err := syscall.GetsockoptIPv6Mreq(int(fd), syscall.IPPROTO_IP, SO_ORIGINAL_DST)
 		if err != nil {
 			log.Trace(newError("failed to call getsockopt").Base(err))
+			return
 		}
 		ip := v2net.IPAddress(addr.Multiaddr[4:8])
 		port := uint16(addr.Multiaddr[2])<<8 + uint16(addr.Multiaddr[3])
 		dest = v2net.TCPDestination(ip, v2net.Port(port))
 	})
 	if err != nil {
-		return v2net.Destination{}, newError("failed to get original destination").Base(err)
+		return v2net.Destination{}, newError("failed to control connection").Base(err)
+	}
+	if !dest.IsValid() {
+		return v2net.Destination{}, newError("failed to call getsockopt")
 	}
 	return dest, nil
 }