net: mvpp2: guard flow control update with global_tx_fc in buffer switching

{
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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/marvell/mvpp2/mvpp2_main.c"
                    ],
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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/marvell/mvpp2/mvpp2_main.c"
                    ],
                    "versions": [
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                            "version": "5.12",
                            "status": "affected"
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                        {
                            "version": "0",
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                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.203",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.167",
                            "lessThanOrEqual": "6.1.*",
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                            "version": "6.6.130",
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                        {
                            "version": "6.12.78",
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                        {
                            "version": "7.0",
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                            "versionType": "original_commit_for_fix"
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                    ]
                }