octeontx2-pf: Fix use-after-free bugs in otx2_sync_tstamp()

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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/octeontx2/nic/otx2_ptp.c"
                    ],
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