Any reason why PQclear() do not assign the pointer to NULL?

Hi,
It only frees memory.

So the following code snippet will crash:

[code]
PQclear( res );
if( serverVersion > curremt_running_vrsion )
{
    res = PQprepare();
//* error checking*/
}
PQclear( res );
[/code]

Thank you.