[RFC PATCH] drm: mock_device can be static

[kernel test robot]

drivers/gpu/drm/selftests/test-drm_damage_helper.c:15:19: warning: symbol 'mock_device' was not declared. Should it be static?
drivers/gpu/drm/selftests/test-drm_damage_helper.c:16:30: warning: symbol 'mock_obj_props' was not declared. Should it be static?
drivers/gpu/drm/selftests/test-drm_damage_helper.c:17:18: warning: symbol 'mock_plane' was not declared. Should it be static?
drivers/gpu/drm/selftests/test-drm_damage_helper.c:18:21: warning: symbol 'mock_prop' was not declared. Should it be static?

Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: kernel test robot <lkp at intel.com>
---
 test-drm_damage_helper.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/selftests/test-drm_damage_helper.c b/drivers/gpu/drm/selftests/test-drm_damage_helper.c
index 1b585c13e042fe..1c19a5d3eefbf8 100644
--- a/drivers/gpu/drm/selftests/test-drm_damage_helper.c
+++ b/drivers/gpu/drm/selftests/test-drm_damage_helper.c
@@ -12,10 +12,10 @@
 #include "test-drm_modeset_common.h"
 
 struct drm_driver mock_driver;
-struct drm_device mock_device;
-struct drm_object_properties mock_obj_props;
-struct drm_plane mock_plane;
-struct drm_property mock_prop;
+static struct drm_device mock_device;
+static struct drm_object_properties mock_obj_props;
+static struct drm_plane mock_plane;
+static struct drm_property mock_prop;
 
 static void mock_setup(struct drm_plane_state *state)
 {