Fix reporting of overrun errors, which should only be reported once
using the inserted null character.
Fixes: 6b8f1ca5581b ("USB: ssu100: set tty_flags in ssu100_process_packet") Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2:
- Use tty_port_tty_get() to look up tty_struct
- Adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>