CVE-2025-38700 scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated

[
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    "vendor": "Linux",
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      "drivers/scsi/libiscsi.c"
    ],
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    "programFiles": [
      "drivers/scsi/libiscsi.c"
    ],
    "versions": [
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      {
        "version": "0",
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]