[Crash-utility] fix bug of struct command

[qiaonuohan]

Hello Dave,

The attachment is used to fix a bug of struct command.

When using command like below, struct command displays wrong data.

<cut>
crash> task_struct.fs ffff88003dfb5540
    fs = 140234226652928
crash> task_struct ffff88003dfb5540
...
    es = 0,
    ds = 0,
    fsindex = 0,
    gsindex = 0,
    *fs = 140234226652928,*
    gs = 0,
    debugreg0 = 0,
...
    io_bitmap_ptr = 0x0,
    iopl = 0,
    io_bitmap_max = 0
  },
  *fs = 0xffff880037795f00,*
  files = 0xffff8800371b6940,
...
<cut>

fs showed by struct command is a member of "struct thread_struct thread;",
not struct task_struct. This bug is involved by adding support to anonymous
member modified by me...

--
--
Regards
Qiao Nuohan


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