Fix 3-parameter form of bit substring() to throw error for negative length,

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 50626efe0aef19fa31fd9ccf79570a24b84bbf01
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-01-07T20:17:44Z
Releases: 9.0.0
Fix 3-parameter form of bit substring() to throw error for negative length,
as required by SQL standard.

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