[HACKERS] chomp PQerrorMessage() in backend uses

Here is a patch to systematically trim the trailing newlines off
PQerrorMessage() results in backend uses (dblink, postgres_fdw,
libpqwalreceiver).

I noticed that there are some inconsistent assumptions about whether
PQerrorMessage() can ever return NULL.  From the code, I think that
should not be possible, but some code appears to be prepared for it.
Other code is not.  What is correct?

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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