USB: serial: mos7720: fix parport use-after-free on probe errors
Do not submit the interrupt URB until after the parport has been
successfully registered to avoid another use-after-free in the
completion handler when accessing the freed parport private data in case
of a racing completion.
Fixes: b69578df7e98 ("USB: usbserial: mos7720: add support for parallel
port on moschip 7715") Cc: stable <stable@vger.kernel.org> Signed-off-by: Johan Hovold <johan@kernel.org>