[PATCH] drm/amd/display: Fix unused variable warning

[Tim Huang]

[Why]
It will build failed with unused variable 'dc' with
'-Werror=unused-variable'enabled when CONFIG_DRM_AMD_DC_DCN
is not defined.

Signed-off-by: Tim Huang <tim.hu...@amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

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 1057f976bec7..8f53c9f6b267 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1027,7 +1027,6 @@ static int dm_dmub_hw_init(struct amdgpu_device *adev)
        const unsigned char *fw_inst_const, *fw_bss_data;
        uint32_t i, fw_inst_const_size, fw_bss_data_size;
        bool has_hw_support;
-       struct dc *dc = adev->dm.dc;
 
        if (!dmub_srv)
                /* DMUB isn't supported on the ASIC. */
@@ -1123,7 +1122,7 @@ static int dm_dmub_hw_init(struct amdgpu_device *adev)
        case IP_VERSION(3, 1, 3): /* Only for this asic hw internal rev B0 */
                hw_params.dpia_supported = true;
 #if defined(CONFIG_DRM_AMD_DC_DCN)
-               hw_params.disable_dpia = dc->debug.dpia_debug.bits.disable_dpia;
+               hw_params.disable_dpia = 
adev->dm.dc->debug.dpia_debug.bits.disable_dpia;
 #endif
                break;
        default:
-- 
2.25.1