fou: Don't allow 0 for FOU_ATTR_IPPROTO.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "Documentation/netlink/specs/fou.yaml",
                        "net/ipv4/fou_nl.c"
                    ],
                    "versions": [
                        {
                            "version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
                            "lessThan": "c7498f9bc390479ccfad7c7f2332237ff4945b03",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
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                        },
                        {
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                            "status": "affected",
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                        },
                        {
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                            "lessThan": "1cc98b8887cabb1808d2f4a37cd10a7be7574771",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
                            "lessThan": "b7db31a52c3862a1a32202a273a4c32e7f5f4823",
                            "status": "affected",
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                        },
                        {
                            "version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
                            "lessThan": "9b75dff8446ec871030d8daf5a69e74f5fe8b956",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23461551c00628c3f3fe9cf837bf53cf8f212b63",
                            "lessThan": "7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "Documentation/netlink/specs/fou.yaml",
                        "net/ipv4/fou_nl.c"
                    ],
                    "versions": [
                        {
                            "version": "3.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.249",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.199",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.162",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.122",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.68",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.8",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }