CVE-2025-38021 drm/amd/display: Fix null check of pipe_ctx->plane_state for update_dchubp_dpp

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix null check of pipectx-planestate for updatedchubpdpp Similar to commit 6a057072ddd1 "drm/amd/display: Fix null check for pipectx-planestate in dcn20programpipe" that addresses a null pointer dereference on...