drm/amd/display: Release state memory if amdgpu_dm_create_color_properties fail

[Why]
Coverity reports RESOURCE_LEAK warning. State memory
is not released if dm_create_color_properties fail.

[How]
Call kfree(state) before return.
Reviewed-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -4229,8 +4229,11 @@ static int amdgpu_dm_mode_config_init(struct amdgpu_device *adev)
 	}
 
 #ifdef AMD_PRIVATE_COLOR
-	if (amdgpu_dm_create_color_properties(adev))
+	if (amdgpu_dm_create_color_properties(adev)) {
+		dc_state_release(state->context);
+		kfree(state);
 		return -ENOMEM;
+	}
 #endif
 
 	r = amdgpu_dm_audio_init(adev);