BUG #5268: PQgetvalue incorrectly returns 0

The following bug has been logged online:

Bug reference:      5268
Logged by:          Mike Landis
Email address:      mlandis@pnmx.com
PostgreSQL version: 8.4.1
Operating system:   Vista
Description:        PQgetvalue incorrectly returns 0
Details:

When I execute the following SQL:

"SELECT COUNT(*) FROM information_schema.tables WHERE table_name='proxies'"

in the PGAdmmin 1.10.0, rev 7945-7946 query tool, I get "1" (the correct
answer).  When I run the exact same SQL in a C program, I get a result set
with one tuple and one field (so far so good), but when I run
PQgetvalue(resultSet,0,0) I get "0" (wrong answer).

Am I missing something?  You can't do squat in a client program without
PQgetvalue().  Is any sort of regression test being run against libpq
functions?

What can I do to get this resolved?