ACPI: sysfs: remove return value of acpi_device_setup_files()

The function can not fail anymore, so drop its return value.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20240709-acpi-sysfs-groups-v2-5-058ab0667fa8@weissschuh.net


Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>