drm/amd/display: Fixed validation return wrong result.

Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 2e77885..1e49b8f 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -654,7 +654,7 @@ bool dc_validate_stream(struct dc *dc, struct dc_stream_state *stream);
 
 bool dc_validate_plane(struct dc *dc, const struct dc_plane_state *plane_state);
 
-bool dc_validate_global_state(
+enum dc_status dc_validate_global_state(
 		struct dc *dc,
 		struct dc_state *new_ctx);