scsi: xen: scsiback: Free unsubmitted command instead of double-putting it

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/xen/xen-scsiback.c"
                    ],
                    "versions": [
                        {
                            "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
                            "lessThan": "9c0f6894982b1f13bda220707497b25ac9c95bdb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
                            "lessThan": "a13b789497a7fdd27d4d63f5c69d23db706ef0fe",
                            "status": "affected",
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                        },
                        {
                            "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
                            "lessThan": "fa588f28401102652068c4cc75e135507f4b5106",
                            "status": "affected",
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                        },
                        {
                            "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
                            "lessThan": "fcd64d4d97af5d9736f31040f8ed8cd4c17e4c45",
                            "status": "affected",
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                        },
                        {
                            "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
                            "lessThan": "f1516c56ac540da1769f264c3cfefe4499548a5d",
                            "status": "affected",
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                        },
                        {
                            "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
                            "lessThan": "1e97c404e44991fb087c38ccd7414f2d326f9b74",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2dbcdf33dbf61f44b29adb52338282c3d7840d0e",
                            "lessThan": "ca978f8a93d4d36841839bf2847d29b88c2591d6",
                            "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/xen/xen-scsiback.c"
                    ],
                    "versions": [
                        {
                            "version": "4.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.212",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.178",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.145",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.97",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.40",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }