[MERGE] remove spurious call in revision store add_revision.

[Robert Collins]

On Wed, 2007-08-22 at 13:29 -0400, John Arbash Meinel wrote:
> John Arbash Meinel has voted tweak.

> ... but we should also avoid calling 
> methods on the return value of functions rather than using a variable)

Why? This is the first I've heard of this, and I think its a pretty
nasty smell to use a temporary variable where none is needed.

-Rob

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