Little change

src/USB2.cpp

@@ -525,7 +525,7 @@ void USB2::write(const Tango::DevVarCharArray *argin)
 		goto error;
 	
 	while (bytes_total < bytes_to_write) {
-		ssize_t bytes_written;
+		int bytes_written;
 		conn_state = libusb_bulk_transfer(dev_handle, ep_down, 
 				argin_data.data() + bytes_total,
 				bytes_to_write - bytes_total, &bytes_written, timeout);