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Jiri assures me that a ldisc->open with tty->disc_data set should never happen, so this check doesn't do anything. Reported-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Signed-off-by: Jakub Kicinski <kuba@kernel.org>