[PATCH] fix crash in kdba bt command

[Anton Blanchard]

> Please apply attached patch to ameslab.  Note, this is just the first,
> there will probably be some more patches coming in the next few days.
>
> This patch fixes a minor bug in th backtrace command; bt <addr>
> was failing to actually trace the stack at addr.

Thanks Linas, applied.

Anton

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