pgsql: Fix a couple of places that would loop forever if attempts to

Log Message:
-----------
Fix a couple of places that would loop forever if attempts to read a stdio file
set ferror() but never set feof().  This is known to be the case for recent
glibc when trying to read a directory as a file, and might be true for other
platforms/cases too.  Per report from Ed L.  (There is more that we ought to
do about his report, but this is one easily identifiable issue.)

Modified Files:
--------------
    pgsql/src/backend/libpq:
        hba.c (r1.199 -> r1.200)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/hba.c?r1=1.199&r2=1.200)
    pgsql/src/interfaces/libpq:
        fe-connect.c (r1.388 -> r1.389)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-connect.c?r1=1.388&r2=1.389)