net/mlx5: LAG, Fix off-by-one in single-FDB error rollback

{
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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/mellanox/mlx5/core/lag/shared_fdb.c"
                    ],
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                        {
                            "version": "6.12.113",
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                            "versionType": "semver"
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                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/ethernet/mellanox/mlx5/core/lag/shared_fdb.c"
                    ],
                    "versions": [
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                        },
                        {
                            "version": "0",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.57",
                            "lessThanOrEqual": "6.18.*",
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                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
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                            "version": "7.2",
                            "lessThanOrEqual": "*",
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                            "versionType": "original_commit_for_fix"
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                }