Log Message:
-----------
Use ReadDir() not readdir() so as to have some modicum of error checking.
Modified Files:
--------------
pgsql/src/backend/utils/adt:
dbsize.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/dbsize.c.diff?r1=1.2&r2=1.3)