Fix use of possible uninitialized variable retval (src/pl/plpgsql/src/pl_handler.c)

[Ranier Vilela]

Hi.

The function *plpgsql_inline_handler* can use uninitialized
variable retval, if PG_TRY fails.
Fix like function*plpgsql_call_handler* wich declare retval as
volatile and initialize to (Datum 0).

best regards,
Ranier Vilela

fix-use-uninitialized-retval-variable-pl_handler.patch
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