A few trivial code cleanups motivated by reading warnings generated

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

Commit: 23836fb1fbe69c53eaaaae40db18ae6120c60135
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-10-18T01:06:24Z
Releases: 8.1.0
A few trivial code cleanups motivated by reading warnings generated
by a recent HP C compiler.  Mostly, get rid of useless local variables
that are assigned to but never used.

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