[PATCH 3/4] drm/mediatek: mtk_cec: Fix non-static global variable

[Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>]

The struct 'mtk_cec_driver' is not used outside of the
mtk_cec.c file, so make it static to silence sparse warning:
```
drivers/gpu/drm/mediatek/mtk_cec.c:243:24: sparse: warning: symbol
'mtk_cec_driver' was not declared. Should it be static?
```

Fixes: 1e914a89ab7e ("drm/mediatek: mtk_cec: Switch to register as module_platform_driver")
Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
---
 drivers/gpu/drm/mediatek/mtk_cec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_cec.c b/drivers/gpu/drm/mediatek/mtk_cec.c
index c7be530ca041..b8ccd6e55bed 100644
--- a/drivers/gpu/drm/mediatek/mtk_cec.c
+++ b/drivers/gpu/drm/mediatek/mtk_cec.c
@@ -240,7 +240,7 @@ static const struct of_device_id mtk_cec_of_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, mtk_cec_of_ids);
 
-struct platform_driver mtk_cec_driver = {
+static struct platform_driver mtk_cec_driver = {
 	.probe = mtk_cec_probe,
 	.remove = mtk_cec_remove,
 	.driver = {

-- 
2.54.0