[PATCH -next] drm/bridge: sii902x: Make sii902x_audio_digital_mute static

[YueHaibing]

Fix sparse warning:

drivers/gpu/drm/bridge/sii902x.c:665:5: warning:
 symbol 'sii902x_audio_digital_mute' was not declared. Should it be static?

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/gpu/drm/bridge/sii902x.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index dd7aa46..c2f97e5 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -662,7 +662,8 @@ static void sii902x_audio_shutdown(struct device *dev, void 
*data)
        clk_disable_unprepare(sii902x->audio.mclk);
 }
 
-int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
+static int sii902x_audio_digital_mute(struct device *dev,
+                                     void *data, bool enable)
 {
        struct sii902x *sii902x = dev_get_drvdata(dev);
 
-- 
2.7.4