Bug in dirstate _iter_changes

[Aaron Bentley]

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John Arbash Meinel wrote:
> Here is another possible patch.

This fixes it for me.  Thanks you.

I wasn't able to apply the other patch-- /usr/bin/patch said it was
invalid, probably because it was inline.

> It should have the same ultimate effect. It just means evaluating the if
> more often. But the code is a little easier to understand.

Sounds like a positive move.

Aaron
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