[PATCH] drm/i2c/tda998x: mark symbol static where possible

[Baoyou Xie]

We get 1 warning when building kernel with W=1:
drivers/gpu/drm/i2c/tda998x_drv.c:1292:5: warning: no previous prototype for 'tda998x_audio_digital_mute' [-Wmissing-prototypes]

In fact, this function is only used in the file in which it is
declared and don't need a declaration, but can be made static.
So this patch marks this function with 'static'.

Signed-off-by: Baoyou Xie <baoyou.xie@xxxxxxxxxx>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 9798d40..af8683e 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -1289,7 +1289,8 @@ static void tda998x_audio_shutdown(struct device *dev, void *data)
 	mutex_unlock(&priv->audio_mutex);
 }
 
-int tda998x_audio_digital_mute(struct device *dev, void *data, bool enable)
+static int
+tda998x_audio_digital_mute(struct device *dev, void *data, bool enable)
 {
 	struct tda998x_priv *priv = dev_get_drvdata(dev);
 
-- 
2.7.4