[COMMITTERS] pgsql: Use correct PG_GETARG macro in pg_convert

[Andrew Dunstan]

Log Message:
-----------
Use correct PG_GETARG macro in pg_convert

Modified Files:
--------------
    pgsql/src/backend/utils/mb:
        mbutils.c (r1.64 -> r1.65)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/mbutils.c?r1=1.64&r2=1.65)

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