CVE-2023-53173 tty: pcn_uart: fix memory leak with using debugfs_lookup()

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/tty/serial/pch_uart.c"
    ],
    "versions": [
      {
        "version": "4dec5f1af694526db760dfbb47211236e556e27c",
        "lessThan": "cf042964c2fa72950bbbf25b2cdd732b873e89db",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "4dec5f1af694526db760dfbb47211236e556e27c",
        "lessThan": "4459d1e7bd0421b3b6fcd745773d8823f71615ef",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "4dec5f1af694526db760dfbb47211236e556e27c",
        "lessThan": "139769c4bd8273b5e3f85ea474aa37018fe7e436",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "4dec5f1af694526db760dfbb47211236e556e27c",
        "lessThan": "04a189c720aa2b6091442113ce9b9bc93552dff8",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/tty/serial/pch_uart.c"
    ],
    "versions": [
      {
        "version": "5.13",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.13",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.100",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.18",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.2.5",
        "lessThanOrEqual": "6.2.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.3",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]