[pgpool-committers: 9849] pgpool: Fix segfault in pgpool main process.

[Tatsuo Ishii]

Fix segfault in pgpool main process.

This is a follow up commit for 0564864e "Fix assorted causes of
segmentation fault.". It lacked the fix while verify_backend_node calls
get_server_version, i.e. checking availability of slots.

Patch provided by: Emond Papegaaij
Backpatch-through: v4.4
Discussion:
[pgpool-general: 9072] Re: Segmentation after switchover
https://www.pgpool.net/pipermail/pgpool-general/2024-April/009133.html

Branch
------
V4_4_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=ad423065f1c8996d36ad093c8fbff2f89104d892

Modified Files
--------------
src/main/pgpool_main.c | 3 +++
1 file changed, 3 insertions(+)