pgsql: Fix a couple of trivial issues in jsonb.c

Fix a couple of trivial issues in jsonb.c

Typo "aggreagate" appeared three times, and the return value of function
JsonbIteratorNext() was being assigned to an int variable in a bunch of
places.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/654809e770ce270c0bb9de726c5df1ab193d60f0

Modified Files
--------------
src/backend/utils/adt/jsonb.c |   20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)