[HACKERS] (libpq) PQclear on questionable result pointer.

[wade]

Greets all,
While attempting to clean up some memory leaks, I have encountered some 
difficulties.  In the code for PQclear() we have the check:

  if (!res)
        return;

The problem arrises when the result object pointer you are passing to clear 
contains not a null and not a valid result object address, but a junk pointer.
PQclear() seg faults when the address is outside of the data segment.
(libpq bug?)
 
My question is, how does one determine when a PGresult* contains the address 
of a valid result object?  Rewriting the calling code is not an option sadly.
What I would like to be able to do is something like this:

        if ( result_is_valid( res ) )
        {
                PQclear( res );
        }

Thanks in advance for any help/suggestions.
  -Wade

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