[COMMITTERS] pgsql: chomp PQerrorMessage() in backend uses

chomp PQerrorMessage() in backend uses

PQerrorMessage() returns an error message with a trailing newline, but
in backend use (dblink, postgres_fdw, libpqwalreceiver), we want to have
the error message without that for emitting via ereport().  To simplify
that, add a function pchomp() that returns a pstrdup'ed string with the
trailing newline characters removed.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/2ed193c904679a533d5e26a27c97119793bcae52

Modified Files
--------------
contrib/dblink/dblink.c                            | 14 +++++-----
contrib/dblink/expected/dblink.out                 |  2 --
contrib/postgres_fdw/connection.c                  | 14 ++--------
.../libpqwalreceiver/libpqwalreceiver.c            | 30 +++++++++++-----------
src/backend/utils/mmgr/mcxt.c                      | 14 ++++++++++
src/include/utils/palloc.h                         |  2 ++
6 files changed, 40 insertions(+), 36 deletions(-)