platform/x86: wmi: use guid_t and guid_equal()

[ Upstream commit 67f472fd ]

Instead of hard-coding a 16 long byte array,
use the available `guid_t` type and related methods.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Link: https://lore.kernel.org/r/20210904175450.156801-15-pobrn@protonmail.com


Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Stable-dep-of: 028e6e20 ("platform/x86: wmi: Break possible infinite loop when parsing GUID")
Signed-off-by: Sasha Levin <sashal@kernel.org>