[android] Don't attempt to read a command on failure to start the forwarder.

tools/android/forwarder2/host_controller.h

Index: tools/android/forwarder2/host_controller.h
diff --git a/tools/android/forwarder2/host_controller.h b/tools/android/forwarder2/host_controller.h
index e6a25e1e42678117e25eeb0cc2b649ac37c63159..1b08220bcf75c019bcf3e3137a9c2b137b3b2984 100644
--- a/tools/android/forwarder2/host_controller.h
+++ b/tools/android/forwarder2/host_controller.h
@@ -67,7 +67,7 @@ class HostController {
   void ReadNextCommandSoon();
   void ReadCommandOnInternalThread();
 
-  void StartForwarder(std::unique_ptr<Socket> host_server_data_socket);
+  bool StartForwarder(std::unique_ptr<Socket> host_server_data_socket);
 
   // Note that this gets also called when ~HostController() is invoked.
   void OnInternalThreadError();