tty: vt/keyboard: use __free()

The vt/keyboard code can use __free to ensure the temporary buffers are
freed. Perform the switch.

And even one non-temporary in kbd_connect(). There are fail paths, so
ensure the buffer is freed in them and not when returning 0 -- by
retain_and_null_ptr().

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://patch.msgid.link/20251119100140.830761-7-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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