drm/i915: clear CRTC color blob pointers after dropping refs

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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "drivers/gpu/drm/i915/display/intel_atomic.c"
                    ],
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{
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                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/i915/display/intel_atomic.c"
                    ],
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                    ]
                }