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commit 75bcbf29 upstream.

Fix reporting of overrun errors, which should only be reported once
using the inserted null character.

Fixes: 6b8f1ca5

 ("USB: ssu100: set tty_flags in ssu100_process_packet")
Signed-off-by: Johan Hovold <johan@kernel.org>
[lizf: Backported to 3.4:
 - adjust context
 - lookup tty using tty_port_tty_get()]
Signed-off-by: Zefan Li <lizefan@huawei.com>