Re-activated the cleanup code in read_thread(). For some unknown reason in

the past, I thought it would be a good idea to move this to hid_close(), but
I can't now understand why, as freeing these objects in read_thread() makes
sense because they are created in read_thread().

This code never made it into hid_close(), so it's now re-activated in
read_thread().

Reported-by: Ludovic Rousseau <ludovic.rousseau@gmail.com>

linux/hid-libusb.c

@@ -513,11 +513,9 @@ static void *read_thread(void *param)
 	   if no transfers are pending, but that's OK. */
 	libusb_cancel_transfer(dev->transfer);
 
-#if 0 // This is done in hid_close()
 	/* Cleanup before returning */
 	free(dev->transfer->buffer);
 	libusb_free_transfer(dev->transfer);
-#endif
 	
 	return NULL;
 }