staging: pi433: Remove stray gpiod_unexport() call

There is no gpiod_export() and gpiod_unexport() looks pretty much stray.
If user space tools somehow belong to that, they should be fixed, the
gpiod_export() and gpiod_unexport() shouldn't be used in a new code,
GPIO sysfs is deprecated. That said, and taking into account staging
state of the driver, simply drop the stray call.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230528140147.32427-1-andriy.shevchenko@linux.intel.com


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