mmc: vub300: fix NULL-deref on disconnect

{
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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/mmc/host/vub300.c"
                    ],
                    "versions": [
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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/mmc/host/vub300.c"
                    ],
                    "versions": [
                        {
                            "version": "3.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.253",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.203",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.169",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.135",
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                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.82",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.23",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.13",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }