staging: vchiq_arm: Avoid NULL ptr deref in vchiq_dump_platform_instances

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c"
                    ],
                    "versions": [
                        {
                            "version": "71bad7f086419dc674244b91ca35a12bfa4cb597",
                            "lessThan": "2eaeb83153b848923a0b121402b4be88223ca62e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71bad7f086419dc674244b91ca35a12bfa4cb597",
                            "lessThan": "176df12b38c70b0a45e6392a0ee5bc83489dfc29",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71bad7f086419dc674244b91ca35a12bfa4cb597",
                            "lessThan": "4627250cabaa80278d3ab01ad107893cea83799f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71bad7f086419dc674244b91ca35a12bfa4cb597",
                            "lessThan": "51e5e5c34c22c0bfec0808d8c33e0b2fcf4c7c89",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "71bad7f086419dc674244b91ca35a12bfa4cb597",
                            "lessThan": "aa899e686d442c63d50f4d369cc02dbbf0941cb0",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c"
                    ],
                    "versions": [
                        {
                            "version": "4.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.273",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.34",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.16.20",
                            "lessThanOrEqual": "5.16.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.17.3",
                            "lessThanOrEqual": "5.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.18",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }