tbstream_dev_valid
ret = tbstream_dev_valid(sdev);
tbstream_dev_valid(sdev) != 0 ||
ret = tbstream_dev_valid(sdev);
ret = tbstream_dev_valid(sdev);
tbstream_dev_valid(sdev) != 0 ||
ret = tbstream_dev_valid(sdev);
if (tbstream_dev_valid(sdev) != 0) {
while ((ret = tbstream_dev_valid(sdev))) {
tbstream_dev_valid(sdev) == 0 ||