pgsql: Harmonize parameter names in contrib code.

Harmonize parameter names in contrib code.

Make sure that function declarations use names that exactly match the
corresponding names from function definitions in contrib code.

Like other recent commits that cleaned up function parameter names, this
commit was written with help from clang-tidy.

Author: Peter Geoghegan <pg(at)bowt(dot)ie>
Discussion: https://postgr.es/m/CAH2-WznJt9CMM9KJTMjJh_zbL5hD9oX44qdJ4aqZtjFi-zA3Tg@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0faf7d933f625eb1668dcaa518b472f722b53a55

Modified Files
--------------
contrib/amcheck/verify_nbtree.c | 2 +-
contrib/cube/cube.c | 2 +-
contrib/dblink/dblink.c | 2 +-
contrib/fuzzystrmatch/dmetaphone.c | 2 +-
contrib/intarray/_int.h | 2 +-
contrib/intarray/_int_selfuncs.c | 4 ++--
contrib/intarray/_int_tool.c | 4 ++--
contrib/ltree/ltree.h | 2 +-
contrib/oid2name/oid2name.c | 14 +++++++-------
contrib/pgcrypto/mbuf.h | 18 +++++++++---------
contrib/pgcrypto/pgcrypto.c | 3 ++-
contrib/pgcrypto/pgp.h | 32 ++++++++++++++++----------------
contrib/pgcrypto/px-crypt.h | 6 +++---
contrib/pgcrypto/px.h | 2 +-
contrib/postgres_fdw/deparse.c | 2 +-
contrib/postgres_fdw/postgres_fdw.c | 2 +-
contrib/postgres_fdw/postgres_fdw.h | 2 +-
contrib/seg/seg.c | 2 +-
contrib/seg/segdata.h | 2 +-
contrib/tablefunc/tablefunc.c | 6 +++---
contrib/test_decoding/test_decoding.c | 6 +++---
21 files changed, 59 insertions(+), 58 deletions(-)