pgsql: Fix multiple bugs in numeric_poly_deserialize().

Fix multiple bugs in numeric_poly_deserialize().

These were evidently introduced by yesterday's commit 9cca11c91,
which perhaps needs more review than it got.

Per report from Andreas Seltenreich and additional examination
of nearby code.

Report: <87oa45qfwq.fsf@credativ.de>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/600dc4c0da3b8c094ccc1ae75b47c8320898c714

Modified Files
--------------
src/backend/utils/adt/numeric.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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