[PATCH] drm/ttm: cleanup coding style a bit

[Bernard Zhao]

Fix sparse warning:
drivers/gpu/drm/ttm/ttm_bo.c:52:1: warning: symbol 'ttm_global_mutex' was not declared. Should it be static?
drivers/gpu/drm/ttm/ttm_bo.c:53:10: warning: symbol 'ttm_bo_glob_use_count' was not declared. Should it be static?

Signed-off-by: Bernard Zhao <bernard at vivo.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 101a68dc615b..eab21643edfb 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -49,8 +49,8 @@ static void ttm_bo_global_kobj_release(struct kobject *kobj);
 /*
  * ttm_global_mutex - protecting the global BO state
  */
-DEFINE_MUTEX(ttm_global_mutex);
-unsigned ttm_bo_glob_use_count;
+static DEFINE_MUTEX(ttm_global_mutex);
+static unsigned int ttm_bo_glob_use_count;
 struct ttm_bo_global ttm_bo_glob;
 EXPORT_SYMBOL(ttm_bo_glob);
 
-- 
2.31.0