[COMMITTERS] pgsql: Back-patch 9.4-era compiler warning fixes into older branches.

Back-patch 9.4-era compiler warning fixes into older branches.

This applies portions of commits b64b5ccb6 and b1aebbb6a to the older
branches, in hopes of getting -Werror builds to succeed there.  The
applied changes simply remove useless tests, eg checking an unsigned
variable to see if it is >= 0.  Recent versions of clang warn about
such tests by default.

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/e9e2bde2d29ceed3817434b85a4dfef84fb25556

Modified Files
--------------
contrib/pg_standby/pg_standby.c | 2 +-
src/interfaces/libpq/fe-exec.c  | 3 +--
2 files changed, 2 insertions(+), 3 deletions(-)