ecpg: Remove useless return values

Peter Eisentraut <peter_e@gmx.net>

Commit: d6148e7d44e91cac8bd21d8c6d3aaaf1eed10486
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-11-04T16:01:05Z
Releases: 11.0
ecpg: Remove useless return values

Remove useless or inconsistently used return values from functions,
matching backend changes 99bf328237d89e0fd22821a940d4af0506353218 and
791359fe0eae83641f0929159d5861359d395e97.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>

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