libpq: Small code clarification, and avoid casting away const

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e685a8e6651b0e55996e6eba6917302607866793

Modified Files
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src/interfaces/libpq/fe-auth.c |   14 ++++++++------
1 files changed, 8 insertions(+), 6 deletions(-)

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