net: macb: put the "mdio" child node reference on success

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/cadence/macb_main.c"
                    ],
                    "versions": [
                        {
                            "version": "8a6631f1cece09047fa44608d21d520ca65ce7d8",
                            "lessThan": "5fba30080d298edb742396073372385c961578d3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a6631f1cece09047fa44608d21d520ca65ce7d8",
                            "lessThan": "7d60dc7ff85b73a2119d582ca2d4456b30960380",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a6631f1cece09047fa44608d21d520ca65ce7d8",
                            "lessThan": "382a373d9ea7a6ac4de9c022385b6217f65ae3cc",
                            "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/net/ethernet/cadence/macb_main.c"
                    ],
                    "versions": [
                        {
                            "version": "6.13",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.13",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }