Bluetooth: ISO: fix race of kfree vs kref_get_unless_zero

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/bluetooth/hci_core.h",
                        "net/bluetooth/hci_conn.c",
                        "net/bluetooth/iso.c"
                    ],
                    "versions": [
                        {
                            "version": "a58d0f5dac322e16cc75334d000666512341bde5",
                            "lessThan": "08ac98f18c8d24cc037858dd6fba2670155e4e84",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
                            "lessThan": "876a3e94c70d0859d1dad1c986112d4f0d99eba8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b",
                            "lessThan": "af24e338bf5dafb80f42baa9a0b9e9b57b1c5d9c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f53e7489273dc2bb307bf50f319b3762d45534f0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6.12.2",
                            "lessThan": "6.12.114",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.11.11",
                            "lessThan": "6.12",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/bluetooth/hci_core.h",
                        "net/bluetooth/hci_conn.c",
                        "net/bluetooth/iso.c"
                    ],
                    "versions": [
                        {
                            "version": "6.13",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.13",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.114",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.8",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }