GHES: Elliminate double-loop in the NMI handler

There's no real need to iterate twice over the HW error sources in the
NMI handler. With the previous cleanups, elliminating the second loop is
almost trivial.

Signed-off-by: Borislav Petkov <bp@suse.de>

diff --cc drivers/acpi/apei/ghes.c
Simple merge