gue: Fix skb memleak with inner IP protocol 0.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/fou_core.c"
                    ],
                    "versions": [
                        {
                            "version": "37dd0247797b168ad1cc7f5dbec825a1ee66535b",
                            "lessThan": "886f186328b718400dbf79e1bc8cbcbd710ab766",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37dd0247797b168ad1cc7f5dbec825a1ee66535b",
                            "lessThan": "380a82d36e37db49fd41ecc378c22fd29392e96a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37dd0247797b168ad1cc7f5dbec825a1ee66535b",
                            "lessThan": "536f5bbc322eb1e175bdd1ced22b236a951c4d8f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37dd0247797b168ad1cc7f5dbec825a1ee66535b",
                            "lessThan": "f87b9b7a618c82e7465e872eb10e14c803871892",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37dd0247797b168ad1cc7f5dbec825a1ee66535b",
                            "lessThan": "ce569b389a5c78d64788a5ea94560e17fa574b35",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37dd0247797b168ad1cc7f5dbec825a1ee66535b",
                            "lessThan": "5437a279804ced8088cabb945dba88a26d828f8c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "37dd0247797b168ad1cc7f5dbec825a1ee66535b",
                            "lessThan": "9a56796ad258786d3624eef5aefba394fc9bdded",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/fou_core.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"
                        }
                    ]
                }