[Session] destroy session file without an open descriptor - #23656
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PS_DESTROY_FUNC(files) skipped the unlink when data->fd was -1, so a destroy of a never-opened or already-closed session file returned SUCCESS while the file stayed on disk. The unlink now always runs after the optional ps_files_close(), tolerating ENOENT via the existing access() check. Sibling audit: PS_DESTROY_FUNC(mm) and mod_user have no descriptor gate, and the files close/read/write paths keep their existing descriptor handling.
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The files save handler skipped unlink when the session file descriptor was -1, so destroy could return success and leave the file on disk. It now closes if needed and unlinks the path, treating a missing file as success.