pgsql: Remove unnecessary uses of Abs()

Remove unnecessary uses of Abs()

Use C standard abs() or fabs() instead.

Reviewed-by: Zhang Mingli <zmlpostgres(at)gmail(dot)com>
Reviewed-by: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Discussion: https://www.postgresql.org/message-id/flat/4beb42b5-216b-bce8-d452-d924d5794c63%40enterprisedb.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/f14aad5169baa5e2ac25d49f1d18f9d5cb3bc7f2

Modified Files
--------------
contrib/btree_gist/btree_date.c | 4 ++--
contrib/btree_gist/btree_float8.c | 4 ++--
contrib/btree_gist/btree_int2.c | 2 +-
contrib/btree_gist/btree_int4.c | 2 +-
contrib/btree_gist/btree_interval.c | 2 +-
contrib/btree_gist/btree_time.c | 2 +-
contrib/btree_gist/btree_ts.c | 2 +-
contrib/btree_gist/btree_utils_num.h | 2 +-
contrib/btree_gist/btree_utils_var.c | 2 +-
contrib/cube/cube.c | 2 +-
contrib/intarray/_int_gist.c | 3 ++-
contrib/intarray/_intbig_gist.c | 4 +++-
contrib/ltree/_ltree_gist.c | 4 +++-
contrib/seg/seg.c | 4 ++--
src/backend/access/gist/gistproc.c | 4 ++--
src/backend/optimizer/geqo/geqo_erx.c | 8 ++++----
src/backend/partitioning/partbounds.c | 4 ++--
src/backend/utils/adt/datetime.c | 8 ++++----
src/backend/utils/adt/numeric.c | 20 ++++++++++----------
src/backend/utils/adt/rangetypes_gist.c | 4 ++--
src/backend/utils/adt/selfuncs.c | 2 +-
src/backend/utils/adt/timestamp.c | 4 ++--
src/backend/utils/adt/tsgistidx.c | 2 +-
src/backend/utils/adt/tsrank.c | 2 +-
src/backend/utils/misc/guc.c | 2 +-
src/interfaces/ecpg/pgtypeslib/interval.c | 4 ++--
26 files changed, 54 insertions(+), 49 deletions(-)