drm/amd/display: Fix Coverity change for visual confirm

[Why && How]
Previous change for Coverity has caused regression on visual confirm
so fix it by reverting the part that affects visual confirm.

Reviewed-by: Chris Park <chris.park@amd.com>
Signed-off-by: Leo (Hanghong) Ma <hanghong.ma@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>