pgsql: Change some Datum to void * for opaque pass-through pointer

Change some Datum to void * for opaque pass-through pointer

Here, Datum was used to pass around an opaque pointer between a group
of functions. But one might as well use void * for that; the use of
Datum doesn't achieve anything here and is just distracting.

Reviewed-by: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Discussion: https://www.postgresql.org/message-id/flat/1c5d23cb-288b-4154-b1cd-191fe2301707%40eisentraut.org

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/b7057e43467ff2d7c04c3abcf5ec35fcc7db9611

Modified Files
--------------
src/backend/tsearch/to_tsany.c | 12 ++++++------
src/backend/utils/adt/tsquery.c | 8 ++++----
src/include/tsearch/ts_utils.h | 4 ++--
3 files changed, 12 insertions(+), 12 deletions(-)