Adjust more backend functions to return OID rather than void.

Robert Haas <rhaas@postgresql.org>

Commit: 82b1b213cad3a69cf5f3dfaa81687c14366960fc
Author: Robert Haas <rhaas@postgresql.org>
Date: 2012-12-29T12:55:37Z
Releases: 9.3.0
Adjust more backend functions to return OID rather than void.

This is again intended to support extensions to the event trigger
functionality.  This may go a bit further than we need for that
purpose, but there's some value in being consistent, and the OID
may be useful for other purposes also.

Dimitri Fontaine

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