[v2] edac: fix skx_edac build error when ACPI_NFIT=m

[Randy Dunlap <rdunlap@infradead.org>]

From: Randy Dunlap <rdunlap@infradead.org>

Prevent build error when CONFIG_ACPI_NFIT=m and CONFIG_EDAC_SKX=y
by limiting EDAC_SKX based on how ACPI_NFIT is set.

Fixes this build error:
drivers/edac/skx_edac.o: In function `get_nvdimm_info':
../drivers/edac/skx_edac.c:399: undefined reference to `nfit_get_smbios_id'

Fixes: 58ca9ac1463d ("EDAC, skx_edac: Detect non-volatile DIMMs")

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: stable@vger.kernel.org
---
 drivers/edac/Kconfig |    1 +
 1 file changed, 1 insertion(+)

v2: add comment in Kconfig file


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--- lnx-417-rc4.orig/drivers/edac/Kconfig
+++ lnx-417-rc4/drivers/edac/Kconfig
@@ -232,6 +232,7 @@ config EDAC_SBRIDGE
 config EDAC_SKX
 	tristate "Intel Skylake server Integrated MC"
 	depends on PCI && X86_64 && X86_MCE_INTEL && PCI_MMCONFIG
+	depends on ACPI_NFIT || !ACPI_NFIT # if ACPI_NFIT=m, EDAC_SKX can't be y
 	select DMI
 	help
 	  Support for error detection and correction the Intel