Use "foo(void)" for definitions of functions with no parameters.

Standard practice in PostgreSQL is to use "foo(void)" instead of
"foo()", as the latter looks like an "old-style" function
declaration.  Similar changes were made in commits cdf4b9aff2,
0e72b9d440, 7069dbcc31, f1283ed6cc, 7b66e2c086, e95126cf04, and
9f7c527af3.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Reviewed-by: Matthias van de Meent <boekewurm+postgres@gmail.com>
Discussion: https://postgr.es/m/aTBObQPg%2Bps5I7vl%40ip-10-97-1-34.eu-west-3.compute.internal

src/backend/access/common/heaptuple.c

@@ -123,7 +123,7 @@ missing_match(const void *key1, const void *key2, Size keysize)
 }
 
 static void
-init_missing_cache()
+init_missing_cache(void)
 {
 	HASHCTL		hash_ctl;
 

src/backend/access/index/genam.c

@@ -488,7 +488,7 @@ systable_beginscan(Relation heapRelation,
  * is declared.
  */
 static inline void
-HandleConcurrentAbort()
+HandleConcurrentAbort(void)
 {
 	if (TransactionIdIsValid(CheckXidAlive) &&
 		!TransactionIdIsInProgress(CheckXidAlive) &&

src/backend/replication/logical/applyparallelworker.c

@@ -640,7 +640,7 @@ pa_detach_all_error_mq(void)
  * Check if there are any pending spooled messages.
  */
 static bool
-pa_has_spooled_message_pending()
+pa_has_spooled_message_pending(void)
 {
 	PartialFileSetState fileset_state;
 

src/backend/replication/logical/sequencesync.c

@@ -711,7 +711,7 @@ LogicalRepSyncSequences(void)
  * resource error and are not repeatable.
  */
 static void
-start_sequence_sync()
+start_sequence_sync(void)
 {
 	Assert(am_sequencesync_worker());
 

src/backend/replication/logical/slotsync.c

@@ -1410,7 +1410,7 @@ check_and_set_sync_info(pid_t worker_pid)
  * Reset syncing flag.
  */
 static void
-reset_syncing_flag()
+reset_syncing_flag(void)
 {
 	SpinLockAcquire(&SlotSyncCtx->mutex);
 	SlotSyncCtx->syncing = false;

src/backend/replication/logical/tablesync.c

@@ -1551,7 +1551,7 @@ start_table_sync(XLogRecPtr *origin_startpos, char **slotname)
  * and starts streaming to catchup with apply worker.
  */
 static void
-run_tablesync_worker()
+run_tablesync_worker(void)
 {
 	char		originname[NAMEDATALEN];
 	XLogRecPtr	origin_startpos = InvalidXLogRecPtr;

src/backend/replication/logical/worker.c

@@ -5561,7 +5561,7 @@ set_stream_options(WalRcvStreamOptions *options,
  * Cleanup the memory for subxacts and reset the related variables.
  */
 static inline void
-cleanup_subxact_info()
+cleanup_subxact_info(void)
 {
 	if (subxact_data.subxacts)
 		pfree(subxact_data.subxacts);
@@ -5621,7 +5621,7 @@ start_apply(XLogRecPtr origin_startpos)
  * It sets up replication origin, streaming options and then starts streaming.
  */
 static void
-run_apply_worker()
+run_apply_worker(void)
 {
 	char		originname[NAMEDATALEN];
 	XLogRecPtr	origin_startpos = InvalidXLogRecPtr;

src/backend/utils/adt/uuid.c

@@ -71,7 +71,7 @@ static int	uuid_fast_cmp(Datum x, Datum y, SortSupport ssup);
 static bool uuid_abbrev_abort(int memtupcount, SortSupport ssup);
 static Datum uuid_abbrev_convert(Datum original, SortSupport ssup);
 static inline void uuid_set_version(pg_uuid_t *uuid, unsigned char version);
-static inline int64 get_real_time_ns_ascending();
+static inline int64 get_real_time_ns_ascending(void);
 static pg_uuid_t *generate_uuidv7(uint64 unix_ts_ms, uint32 sub_ms);
 
 Datum
@@ -545,7 +545,7 @@ gen_random_uuid(PG_FUNCTION_ARGS)
  * than the previous returned timestamp (on this backend).
  */
 static inline int64
-get_real_time_ns_ascending()
+get_real_time_ns_ascending(void)
 {
 	static int64 previous_ns = 0;
 	int64		ns;

src/bin/pg_basebackup/pg_createsubscriber.c

@@ -78,7 +78,7 @@ struct LogicalRepInfos
 };
 
 static void cleanup_objects_atexit(void);
-static void usage();
+static void usage(void);
 static char *get_base_conninfo(const char *conninfo, char **dbname);
 static char *get_sub_conninfo(const struct CreateSubscriberOptions *opt);
 static char *get_exec_path(const char *argv0, const char *progname);