[RFC PATCH] drivers core: device_root_tasks_done can be static

[kbuild test robot]

Fixes: 6d54ba128905 ("drivers core: multi-threading device shutdown")
Signed-off-by: Fengguang Wu <fengguang...@intel.com>
---
 core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 110d797..666c163 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2874,7 +2874,7 @@ static int device_shutdown_child_task(void *data);
  */
 static atomic_t                device_root_tasks_finished;
 static atomic_t                device_root_tasks_started;
-struct completion      device_root_tasks_done;
+static struct completion       device_root_tasks_done;
 
 /**
  * Shutdown device tree with root started in dev. If dev has no children