Thread: pgsql: Fix handling of previous password hooks in passwordcheck

Fix handling of previous password hooks in passwordcheck

When piling up loading of modules using check_password_hook_type,
loading passwordcheck would remove any trace of a previously-loaded
hook.  Unloading the module would also cause previous hooks to be
entirely gone.

Reported-by: Rafael Castro
Author: Michael Paquier
Reviewed-by: Daniel Gustafsson
Discussion: https://postgr.es/m/15932-78f48f9ef166778c@postgresql.org
Backpatch-through: 9.4

Branch
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REL9_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/4536e494fdf2d6ec493751a193f8086d327848d6

Modified Files
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contrib/passwordcheck/passwordcheck.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)