ACPICA: Fix memory leak if acpi_ps_get_next_namepath() fails

ACPICA: Fix memory leak if acpi_ps_get_next_namepath() fails

ACPICA commit 2802af722bbde7bf1a7ac68df68e179e2555d361

If acpi_ps_get_next_namepath() fails, the previously allocated
union acpi_parse_object needs to be freed before returning the
status code.

The issue was first being reported on the Linux ACPI mailing list:

Link: https://lore.kernel.org/linux-acpi/56f94776-484f-48c0-8855-dba8e6a7793b@yandex.ru/T/
Link: https://github.com/acpica/acpica/commit/2802af72
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>