Additional ACPI updates for 5.1-rc1 - Fix a crash caused by unloading an SSDT overlay (Andy Shevchenko). - Prevent user space from getting confusing error values on failing ACPI sysfs accesses (Rafael Wysocki). - Simplify leaf node detection in the PPTT parsing code by using a new flag defined in ACPI 6.3 (Jeremy Linton). - Add missing "static" in some places in the ACPI configfs code (Andy Shevchenko). - Fix acpidbg tool path in the ACPI documentation (Flavio Suligoi).