[Crash-utility] [PATCH] ppc64: rework bt command

[Dave Anderson]

As an addendum to crash commit 5fe78861ea1589084f6a2956a6ff63677c9269e1,
this patch for the ppc64 "bt" command prevents an invalid error message
from being displayed when an active non-panic task is interrupted while
running in user space.  Without the patch, the command correctly indicates
"Task is running in user space", dumps the user-space exception frame, but
then prints the invalid error message "bt: invalid kernel virtual address:
ffffffffffffff90 type: Regs NIP value".

The patch has been ACK'd offline by Hari Bathini.

Thanks,
  Dave

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