[BRLTTY] Regression Hedo MobiLine

[Sebastian Humenda]

Hi

With the latest BRLTTY from master, I am unable to use my Hedo MobiLine. It used
to work on Debian stable with 5.4.
Due to problems with the display, I had it repaired. During this time, I also
upgraded my system, ending up with BRLTTY 5.6 and as soon as I got the display
back, it didn't work anymore.
For debugging, I compiled versions 5.5 and 5.4 and the display only works with
5.4. However, it seems as if Hedo changed something with the protocol, because
the display does not react to key presses and the first two characters of the
display show useless signs. This makes me believe that there is both a
regression in BRLTTY and a protocol change on the manufacturer's side.

I've attached the output of `lsusb` below, please let me know what else I could
provide to help resolving this.

Thanks
Sebastian
===
Bus 001 Device 002: ID 8087:8001 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 17ef:1013 Lenovo 
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 010: ID 04ca:703c Lite-On Technology Corp. 
Bus 002 Device 007: ID 8087:0a2a Intel Corp. 
Bus 002 Device 005: ID 138a:0017 Validity Sensors, Inc. Fingerprint Reader
Bus 002 Device 003: ID 058f:9540 Alcor Micro Corp. AU9540 Smartcard Reader
Bus 002 Device 023: ID 04a9:190a Canon, Inc. CanoScan LiDE 210
Bus 002 Device 044: ID 0f4e:0112 Freedom Scientific 
Bus 002 Device 021: ID 17ef:1013 Lenovo 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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