pg_waldump got an error with waldump file generated by initdb

From: Dong Wook Lee <sh95119(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: pg_waldump got an error with waldump file generated by initdb
Date: 2022-07-10 12:51:04
Message-ID: 20220710125002.s2xfyrpovszm2brs@home-desktop
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Hi, hackers

I don't know if this is an error.
when I do ./initdb -D ../data and execute pg_waldump like this, In the last part I got an error.

```
./pg_waldump ../data/pg_wal/000000010000000000000001
```

pg_waldump: error: error in WAL record at 0/1499990: invalid record length at 0/1499A08: wanted 24, got 0

my environment is `16devel on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, 64-bit`
Is this normal?

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