- ret = serial_read_blocking(serial, buf, 4, serial_timeout(serial, 4));
- if (ret != 4) {
- sr_err("Invalid reply (expected 4 bytes, got %d).", ret);
+ num_read = serial_read_blocking(serial, buf, 4, serial_timeout(serial, 4));
+ if (num_read < 0) {
+ sr_err("Getting ID reply failed (%d).", num_read);