[MERGE][1.7] Fix '_in_buffer' AttributeError when using the -Dhpss debug flag.

[John Arbash Meinel]

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Andrew Bennetts wrote:
> Hi,
> 
> When bzrlib/smart/protocol.py was changed to reduce string concatenations for
> 1.6, one use of the old “_in_buffer” attribute of ProtocolThreeDecoder inside a
> -Dhpss code path wasn't changed.
> 
> This trivial patch updates that spot, and for good measure removes a commented
> out line of code that referenced that attribute too.  I checked for other uses
> with grep, and didn't find any other uses.
> 
> This patch is very small and safe, and helps debugging with -Dhpss, so I think
> it's worth cherry-picking into 1.7.
> 
> -Andrew.
> 
> 

BB:approve

For bzr.dev and for 1.7.

John
=:->

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