i7core_edac: return -ENODEV if no MC is found
Nehalem-EX uses a different memory controller. However, as the
memory controller is not visible on some Nehalem/Nehalem-EP, we
need to indirectly probe via a X58 PCI device. The same devices
are found on (some) Nehalem-EX. So, on those machines, the
probe routine needs to return -ENODEV, as the actual Memory
Controller registers won't be detected.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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