pgsql: Suppress uninitialized-variable warning from less-bright compile

Suppress uninitialized-variable warning from less-bright compilers.

The type variable must get set on first iteration of the while loop,
but there are reasonably modern gcc versions that don't realize that.
Initialize it with a dummy value. This undoes a removal of initialization
in commit 654809e770ce270c0bb9de726c5df1ab193d60f0.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/60ff5de22aa4781f60cc141e2518c242c66d9235

Modified Files
--------------
src/backend/utils/adt/jsonb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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