drm/amd/pm: fix pptable use-after-free

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                        "drivers/gpu/drm/amd/pm/amdgpu_dpm.c",
                        "drivers/gpu/drm/amd/pm/amdgpu_pm.c",
                        "drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h"
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{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/amd/pm/amdgpu_dpm.c",
                        "drivers/gpu/drm/amd/pm/amdgpu_pm.c",
                        "drivers/gpu/drm/amd/pm/inc/amdgpu_dpm.h"
                    ],
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                        {
                            "version": "6.6.153",
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