drm/amd/display: Fix null check for pipe_ctx->plane_state in hwss_setup_dpp

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UBUNTU-CVE-2024-53200

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix null check for pipectx-planestate in hwsssetupdpp This commit addresses a null pointer dereference issue in hwsssetupdpp. The issue could occur when pipectx-planestate is null. The fix adds a check to ensure...