pgsql: Get rid of trailing semicolons in C macro definitions.

Get rid of trailing semicolons in C macro definitions.

Writing a trailing semicolon in a macro is almost never the right thing,
because you almost always want to write a semicolon after each macro
call instead.  (Even if there was some reason to prefer not to, pgindent
would probably make a hash of code formatted that way; so within PG the
rule should basically be "don't do it".)  Thus, if we have a semi inside
the macro, the compiler sees "something;;".  Much of the time the extra
empty statement is harmless, but it could lead to mysterious syntax
errors at call sites.  In perhaps an overabundance of neatnik-ism, let's
run around and get rid of the excess semicolons whereever possible.

The only thing worse than a mysterious syntax error is a mysterious
syntax error that only happens in the back branches; therefore,
backpatch these changes where relevant, which is most of them because
most of these mistakes are old.  (The lack of reported problems shows
that this is largely a hypothetical issue, but still, it could bite
us in some future patch.)

John Naylor and Tom Lane

Discussion: https://postgr.es/m/CACPNZCs0qWTqJ2QUSGJ07B7uvAvzMb-KbG2q+oo+J3tsWN5cqw@mail.gmail.com

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/49718aa9ee5ee9a667cdd50e659687490716c94a

Modified Files
--------------
contrib/btree_gist/btree_ts.c             |  5 +++--
contrib/btree_gist/btree_utils_num.h      |  2 +-
contrib/pg_trgm/trgm.h                    |  2 +-
contrib/pgcrypto/crypt-blowfish.c         | 12 +++++++-----
src/backend/nodes/readfuncs.c             |  8 ++++----
src/backend/utils/adt/formatting.c        |  2 +-
src/backend/utils/sort/gen_qsort_tuple.pl |  2 +-
src/bin/pg_dump/pg_backup_archiver.h      |  2 +-
src/include/access/nbtree.h               |  2 +-
src/port/qsort.c                          |  2 +-
src/port/qsort_arg.c                      |  2 +-
11 files changed, 22 insertions(+), 19 deletions(-)