Fix possible variable declaration uninitialized (src/backend/utils/adt/varlena.c)

[Ranier Vilela]

Hi,

This is not a live bug.
I think this is worth fixing, just for the sake of style and code
correctness.
As a bonus, we have a reduced scope and standardized return.

regards,
Ranier Vilela

fix_possible_decl_var_uninitialized_varlena.patch
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