[PATCH -next] drm/rockchip: cdn-dp: Mark cdn_dp_resume as __maybe_unused

[Wei Yongjun]

The function cdn_dp_resume() may have no callers depending
on configuration, so it must be marked __maybe_unused to
avoid harmless warning:

drivers/gpu/drm/rockchip/cdn-dp-core.c:1124:12: warning:
 'cdn_dp_resume' defined but not used [-Wunused-function]
 1124 | static int cdn_dp_resume(struct device *dev)
      |            ^~~~~~~~~~~~~

Reported-by: Hulk Robot <hulkci at huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1 at huawei.com>
---
 drivers/gpu/drm/rockchip/cdn-dp-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index a4a45daf93f2..1162e321aaed 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -1121,7 +1121,7 @@ static int cdn_dp_suspend(struct device *dev)
 	return ret;
 }
 
-static int cdn_dp_resume(struct device *dev)
+static int __maybe_unused cdn_dp_resume(struct device *dev)
 {
 	struct cdn_dp_device *dp = dev_get_drvdata(dev);