[PATCH] drm/amdgpu/display/mst: fix an unused-variable warning

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

The newly added code is in an #ifdef, so the variables that
are only used in there cause a warning if CONFIG_DRM_AMD_DC_DCN
is disabled:

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: In function 'amdgpu_dm_atomic_check':
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9698:43: error: unused variable 'mst_state' [-Werror=unused-variable]
 9698 |         struct drm_dp_mst_topology_state *mst_state;
      |                                           ^~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9697:41: error: unused variable 'mgr' [-Werror=unused-variable]
 9697 |         struct drm_dp_mst_topology_mgr *mgr;
      |                                         ^~~

Fixes: c689e1e362ea ("drm/amdgpu/display/mst: Fix mst_state->pbn_div and slot count assignments")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index be1232356f9e..c966bb05f6c7 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9694,8 +9694,10 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
 	struct drm_connector_state *old_con_state, *new_con_state;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
+#if defined(CONFIG_DRM_AMD_DC_DCN)
 	struct drm_dp_mst_topology_mgr *mgr;
 	struct drm_dp_mst_topology_state *mst_state;
+#endif
 	struct drm_plane *plane;
 	struct drm_plane_state *old_plane_state, *new_plane_state;
 	enum dc_status status;
-- 
2.39.0