libpq: Fix memory leak

If a client encoding is specified as a connection parameter (or
environment variable), internal storage allocated for it would never
be freed.

Branch
------
REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/0ba7ff5fa542c1cf77bac001c534ff0c82b2fde2

Modified Files
--------------
src/interfaces/libpq/fe-connect.c |    2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

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