Silence compiler warning on an unused variable

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 0aeb5ae2041520f02cabbc7083aec46733689bce
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2013-07-22T17:15:13Z
Releases: 9.4.0
Silence compiler warning on an unused variable

Also, tweak wording in comments (per Andres) and documentation (myself)
to point out that it's the database's default tablespace that can be
passed as 0, not DEFAULTTABLESPACE_OID.  Robert Haas noticed the bug in
the code, but didn't update the accompanying prose.

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