Handle the camera open failure better.

Check if camera hardware is NULL to avoid mediaserver crash.

Change-Id: Ibde0251f30bdb6b36a5d5380222d7be25ec9449c
diff --git a/services/camera/libcameraservice/CameraService.h b/services/camera/libcameraservice/CameraService.h
index 77ccf41..0d69836 100644
--- a/services/camera/libcameraservice/CameraService.h
+++ b/services/camera/libcameraservice/CameraService.h
@@ -106,6 +106,7 @@
         friend class CameraService;
                                 Client(const sp<CameraService>& cameraService,
                                        const sp<ICameraClient>& cameraClient,
+                                       const sp<CameraHardwareInterface>& hardware,
                                        int cameraId,
                                        int clientPid);
                                 ~Client();