Remove unnecessary parentheses in assignments.

Bruce Momjian <bruce@momjian.us>

Commit: 9dbd00b0e22d6583d5f1f436eaaf000b73d201b1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2005-07-21T04:41:43Z
Releases: 8.1.0
Remove unnecessary parentheses in assignments.
Add spaces where needed.
Reference time interval variables as tinterval.

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