In pg_upgrade, no need to initialize global struct values; they are

always zeros.  Also no need to free memory before we exit.

contrib/pg_upgrade/info.c

@@ -22,12 +22,6 @@ static void free_rel_infos(RelInfoArr *rel_arr);
 static void print_db_infos(DbInfoArr *dbinfo);
 static void print_rel_infos(RelInfoArr *arr);
 
-void
-initialize_cluster_info(ClusterInfo *cluster)
-{
-	cluster->dbarr.ndbs = 0;
-	cluster->dbarr.dbs = NULL;
-}
 
 /*
  * gen_db_file_maps()

contrib/pg_upgrade/pg_upgrade.c

@@ -63,9 +63,6 @@ main(int argc, char **argv)
 	char	   *deletion_script_file_name = NULL;
 	bool		live_check = false;
 
-	initialize_cluster_info(&old_cluster);
-	initialize_cluster_info(&new_cluster);
-
 	parseCommandLine(argc, argv);
 
 	output_check_banner(&live_check);
@@ -428,31 +425,10 @@ set_frozenxids(void)
 static void
 cleanup(void)
 {
-	int			tblnum;
 	char		filename[MAXPGPATH];
 
-	for (tblnum = 0; tblnum < os_info.num_tablespaces; tblnum++)
-		pg_free(os_info.tablespaces[tblnum]);
-	pg_free(os_info.tablespaces);
-
-	free_db_and_rel_infos(&old_cluster.dbarr);
-	free_db_and_rel_infos(&new_cluster.dbarr);
-	pg_free(log_opts.filename);
-	pg_free(os_info.user);
-	pg_free(old_cluster.controldata.lc_collate);
-	pg_free(new_cluster.controldata.lc_collate);
-	pg_free(old_cluster.controldata.lc_ctype);
-	pg_free(new_cluster.controldata.lc_ctype);
-	pg_free(old_cluster.controldata.encoding);
-	pg_free(new_cluster.controldata.encoding);
-	pg_free(old_cluster.tablespace_suffix);
-	pg_free(new_cluster.tablespace_suffix);
-
-	if (log_opts.fd != NULL)
-	{
+	if (log_opts.fd)
 		fclose(log_opts.fd);
-		log_opts.fd = NULL;
-	}
 
 	if (log_opts.debug_fd)
 		fclose(log_opts.debug_fd);

contrib/pg_upgrade/pg_upgrade.h

@@ -326,7 +326,6 @@ void		check_loadable_libraries(void);
 
 /* info.c */
 
-void		initialize_cluster_info(ClusterInfo *cluster);
 FileNameMap *gen_db_file_maps(DbInfo *old_db,
 				 DbInfo *new_db, int *nmaps, const char *old_pgdata,
 				 const char *new_pgdata);