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:
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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)