btrfs: zoned: don't clobber the extent buffer when zeroing it out

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/disk-io.c",
                        "fs/btrfs/extent_io.c"
                    ],
                    "versions": [
                        {
                            "version": "aa6313e6ff2bfbf736a2739047bba355d8241584",
                            "lessThan": "efa5084d08030aa557fdefa3e4a73b2501b7d207",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "aa6313e6ff2bfbf736a2739047bba355d8241584",
                            "lessThan": "92484ad014f2e2b0e0e7bbc1610951e978cf557c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "aa6313e6ff2bfbf736a2739047bba355d8241584",
                            "lessThan": "98e3747587f9f87f010d8d7e55786216249a94af",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "aa6313e6ff2bfbf736a2739047bba355d8241584",
                            "lessThan": "db4b9eefc8ee0bcaeee4d5e6a7313905f6a2fe7c",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/disk-io.c",
                        "fs/btrfs/extent_io.c"
                    ],
                    "versions": [
                        {
                            "version": "6.8",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.8",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.114",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.52",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.6",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }