CVE-2025-38125 net: stmmac: make sure that ptp_rate is not 0 before configuring EST

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CVE-2025-38126 and CVE-2025-38125 Address PTP Configuration Issues Two vulnerabilities, CVE-2025-38126 and CVE-2025-38125, were reported in the net: stmmac driver related to timestamping and EST configuration. Both vulnerabilities emphasize the need to ensure that the ptp_rate is not set to zero, which could lead to misconfigurations. Affected systems include those utilizing the stmmac driver for network operations. 2 sources 44