BUG #4964: return value does not agree with documentation

The following bug has been logged online:

Bug reference:      4964
Logged by:          jasen Betts
Email address:      jasen@xnet.co.nz
PostgreSQL version: 8.3
Operating system:   linux
Description:        return value does not agree with documentation
Details:

PQsendQuery() seems to return 0 on success and 1 on failure contrary to the
documented behavior.

http://www.postgresql.org/docs/8.3/interactive/libpq-async.html