[PATCH] drm/amdgpu: declare static function to fix compiler warning

[Guchun Chen <guchun.chen@xxxxxxx>]

>> drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c:503:6: warning: no previous prototype for function 'release_psp_cmd_buf' [-Wmissing-prototypes]
   void release_psp_cmd_buf(struct psp_context *psp)
        ^
   drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c:503:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void release_psp_cmd_buf(struct psp_context *psp)
   ^
   static
   1 warning generated.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Guchun Chen <guchun.chen@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
index c641f84649d6..b48d68d30d80 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
@@ -518,7 +518,7 @@ static struct psp_gfx_cmd_resp *acquire_psp_cmd_buf(struct psp_context *psp)
 	return cmd;
 }
 
-void release_psp_cmd_buf(struct psp_context *psp)
+static void release_psp_cmd_buf(struct psp_context *psp)
 {
 	mutex_unlock(&psp->mutex);
 }
-- 
2.17.1