A NULL pointer reference kernel bug was observed when
acpi_nfit_add_dimm() called in acpi_nfit_register_dimms()
failed. This error path does not set nfit_mem->nvdimm, but
the 2nd list_for_each_entry() loop in the function assumes
it's always set. Add a check to nfit_mem->nvdimm.

Signed-off-by: Toshi Kani <toshi.k...@hpe.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
 drivers/acpi/nfit/core.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index abeb4df4f22e..b28ce440a06f 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1867,6 +1867,9 @@ static int acpi_nfit_register_dimms(struct acpi_nfit_desc 
                struct kernfs_node *nfit_kernfs;
                nvdimm = nfit_mem->nvdimm;
+               if (!nvdimm)
+                       continue;
                nfit_kernfs = sysfs_get_dirent(nvdimm_kobj(nvdimm)->sd, "nfit");
                if (nfit_kernfs)
                        nfit_mem->flags_attr = sysfs_get_dirent(nfit_kernfs,
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