Avoid file descriptor leak in pg_test_fsync.

This can cause problems on Windows, where files that are still open
can't be unlinked.

Jeff Janes

contrib/pg_test_fsync/pg_test_fsync.c

@@ -258,8 +258,6 @@ test_sync(int writes_per_op)
 	}
 	else
 	{
-		if ((tmpfile = open(filename, O_RDWR | O_DSYNC | PG_O_DIRECT, 0)) == -1)
-			die("could not open output file");
 		START_TIMER;
 		for (ops = 0; alarm_triggered == false; ops++)
 		{