pgsql: Insert additional compiler placation into objectaddress.c.

Log Message:
-----------
Insert additional compiler placation into objectaddress.c.

Peter Eisentraut reports that some bits of the "address" variable
in get_object_address() give "may be used uninitialized" warnings;
this likes the only excuse his compiler could have for thinking
that's possible.

Modified Files:
--------------
    pgsql/src/backend/catalog:
        objectaddress.c (r1.1 -> r1.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/objectaddress.c?r1=1.1&r2=1.2)