[pgpool-committers: 4796] pgpool: Fix memory leaks related to pool_extract_error_message().

[Tatsuo Ishii]

Fix memory leaks related to pool_extract_error_message().

After 3.4, the function starts to return palloc'ed memory, and the
caller should had been modified so that they pfree the memory returned
by it but actually they had not.

Branch
------
V3_4_STABLE

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=a393d0e6e6ad381802de82e5dbd95be3d60ec70d

Modified Files
--------------
src/auth/pool_auth.c              | 15 ++++++++++++---
src/protocol/child.c              |  3 ++-
src/protocol/pool_process_query.c |  4 +++-
src/protocol/pool_proto_modules.c |  1 +
4 files changed, 18 insertions(+), 5 deletions(-)