BUG #17454: Using psql without ipv4 address,the inet_server_port do not return PORT.

The following bug has been logged on the website:

Bug reference: 17454
Logged by: Laowu wong
Email address: thbytwo(at)live(dot)cn
PostgreSQL version: 14.2
Operating system: centos 7
Description:

It should return the server port when I execute 'select inet_server_port();'
with the command line 'psql -p 15431'.
It seems that if I do not enter the ipv4 address in the
psql-command-line,the pg will return null.

the current behavior:
[postgres(at)pc67 ~]$ /home/postgres/pgREL1402/bin/psql -p 15431
psql (14.2)
Type "help" for help.

postgres=# select inet_server_port();
inet_server_port
------------------

(1 row)

the expected:
[postgres(at)pc67 ~]$ /home/postgres/pgREL1402/bin/psql -p 15431
psql (14.2)
Type "help" for help.

postgres=# select inet_server_port();
inet_server_port
------------------
15431
(1 row)

the env：
centos 7 x86
PG14.2