[MERGE][1.7] Trivial fix for sftp readv

[Aaron Bentley]

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John Arbash Meinel wrote:
> Anyway, with this patch, 'bzr branch sftp://localhost/...' drops from 37s =>
> ~30s. And I imagine it is even better when dealing with bigger branches.

It it possible that this fixes
https://bugs.launchpad.net/bzr/+bug/182469 ?

Aaron
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