Fix the following sparse warning:

drivers/nvdimm/security.c:416:6: warning: symbol 
'__nvdimm_security_overwrite_query'
was not declared. Should it be static?

Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Zou Wei <[email protected]>
---
 drivers/nvdimm/security.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c
index 89b8597..11fb5ad 100644
--- a/drivers/nvdimm/security.c
+++ b/drivers/nvdimm/security.c
@@ -413,7 +413,7 @@ static int security_overwrite(struct nvdimm *nvdimm, 
unsigned int keyid)
        return rc;
 }
 
-void __nvdimm_security_overwrite_query(struct nvdimm *nvdimm)
+static void __nvdimm_security_overwrite_query(struct nvdimm *nvdimm)
 {
        struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nvdimm->dev);
        int rc;
-- 
2.6.2
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