BUG #6353: If there is invalid line in pg_hba.conf, DB start fails without any nofice and no logs in pgstartup.

The following bug has been logged on the website:

Bug reference:      6353
Logged by:          Erkan Durmus
Email address:      erkan@eurotel.com.tr
PostgreSQL version: 9.0.6
Operating system:   Centos 5.7
Description:=20=20=20=20=20=20=20=20

Hi,
Firstly, thanks for developing Pgsql!
Problem:
If I add this line to pg_hba.conf, it causes a silent startup failure:
local    all            backup          127.0.0.1/32       trust
There is a linux user backup on this system. After adding this line and
issue "pg_ctl reload" it signals server successfully, no errors. But if I
stop db server, I can not start db anymore. Strangely no log exists in
pgstartup.log. Even I start with -d 5 debug param, it exists after "logging
shutdown" message. Debugging with gdb didn't help. After removing the line
added above in pg_hba.conf, db starts.

Regards,
Erkan Durmus