Comment # 1 on bug 1042878 from Jiri Slaby

Fixed by this, hopefully:
commit 8a8dabf2dd68caff842d38057097c23bc514ea6e
Author: Alan Cox <alan@llwyncelyn.cymru>
Date:   Fri Jun 2 13:49:30 2017 +0100

    tty: handle the case where we cannot restore a line discipline