Fix streaming replication starting at the very first WAL segment.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: cd2b7d3c4d1b3daa4f8e07d5702ed9e699adc361
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2010-02-25T07:31:40Z
Releases: 9.0.0
Fix streaming replication starting at the very first WAL segment.
Per complaint from Greg Stark.

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