CVE-2025-38135 serial: Fix potential null-ptr-deref in mlb_usio_probe()

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Microsoft Addresses CVE-2025-38184 and CVE-2025-38135 Null Pointer Dereference Vulnerabilities Microsoft has published information regarding two vulnerabilities, CVE-2025-38184 and CVE-2025-38135, both related to null pointer dereference issues in their software. CVE-2025-38184 was published on July 4, 2025, while CVE-2025-38135 was published on July 3, 2025. These vulnerabilities could potentially affect systems utilizing the respective components. 4 sources 45