Standardize treatment of strcmp() return value

Peter Eisentraut <peter_e@gmx.net>

Commit: 037a82704ce644e2b1c3946345b54444caddb1a5
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2011-12-27T19:19:09Z
Releases: 9.2.0
Standardize treatment of strcmp() return value

Always compare the return value to 0, don't use cute tricks like
if (!strcmp(...)).

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