ACPI / bus: Tidy up _OSC error spacing

The whitespace in _OSC error reports is weird.  Improve it.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>