pgsql: Fix use of already freed memory when dumping a database's securi

Fix use of already freed memory when dumping a database's security label.

pg_dump.c:dumDatabase() called ArchiveEntry() with the results of a a
query that was PQclear()ed a couple lines earlier.

Backpatch to 9.2 where security labels for shared objects where
introduced.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/525b84c576e119de7f2b0d00e3a99d559771aa7b

Modified Files
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src/bin/pg_dump/pg_dump.c |   14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)