[pgpool-committers: 2114] pgpool: Back porting coverity issues fix patch from master branch.

[Muhammad Usama]

Back porting coverity issues fix patch from master branch.
Fix coverity issue:1111377 Unchecked return value
Fix coverity issue:1111381 Logically dead code
Fix coverity issue:1222992 Unchecked return value
Fix coverity issue:1222993 Unchecked return value

Branch
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V3_0_STABLE

Details
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http://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=7fd63a2cbc29eea40e0f1a1c004606b9a6382d16

Modified Files
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child.c                |    5 ++--
main.c                 |   72 +++++++++++++++++++++++++++---------------------
pool_auth.c            |    6 ----
pool_session_context.c |   10 ++++++-
4 files changed, 52 insertions(+), 41 deletions(-)