BUG #18338: Memory leak in function 'dumpRule'

The following bug has been logged on the website:

Bug reference:      18338
Logged by:          Jora
Email address:      jora.gevorgyan@rau.am
PostgreSQL version: 16.2
Operating system:   Ubuntu 20.04
Description:

The memory leak is found by a static analyzer developed at [CAST](
https://www.linkedin.com/company/cast-center/).

The memory alocated at [in qtabname]() is getting lost when function
[pg_fatal is

called](https://github.com/postgres/postgres/blob/09eb633e1baa3b7cd7929f3cc77f9c46f63c20b1/src/bin/pg_dump/pg_dump.c#L18007)