Fix deadlock if the last reference of ICameraClient is removed in

Camera::~Camera()

{

    disconnect();

    // We don't need to call disconnect() here because if the CameraService

    // thinks we are the owner of the hardware, it will hold a (strong)

    // reference to us, and we can't possibly be here. We also don't want to

    // call disconnect() here if we are in the same process as mediaserver,

    // because we may be invoked by CameraService::Client::connect() and will

    // deadlock if we call any method of ICamera here.

}

int32_t Camera::getNumberOfCameras()