Improve error handling during MTP startup

void twmtp_MtpServer::start()

{

	setup();

	if (setup() == 0) {

		add_storage();

		server->run();

	}

}

void twmtp_MtpServer::set_storages(storages* mtpstorages) {

	stores = mtpstorages;

}

void twmtp_MtpServer::setup()

int twmtp_MtpServer::setup()

{

	#define USB_MTP_DEVICE "/dev/mtp_usb"

	usePtp =  false;

		refserver = server;

		MTPI("created new mtpserver object\n");

	} else {

		MTPE("could not open MTP driver, errno: %d", errno);

		MTPE("could not open MTP driver, errno: %d\n", errno);

		return -1;

	}

	return 0;

}

void twmtp_MtpServer::run()

class twmtp_MtpServer {

	public:

		void start();

		void setup();

		int setup();

		void run();

		void cleanup();

		void send_object_added(int handle);