n_tty: pass ldata to canon_skip_eof() directly

'tty' is not needed in canon_skip_eof(), so we can pass 'ldata' directly
instead.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230712064216.12150-4-jirislaby@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>