libpq: Fix memory leak in URI parser

When an invalid query parameter is reported, some memory leaks.

found by Coverity

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/1c8c084cdc136388835e0d703a5e26272e0a8f2f

Modified Files
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src/interfaces/libpq/fe-connect.c |    5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

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