Allows to uninstall a particular handler installed to get notifications about the connection close.
If the handler is found, it will be uninstalled and the data associated to the handler will be returned.
|connection ||The connection where the uninstall operation will be performed.|
|on_close_handler ||The handler to uninstall.|
|data ||In order to remove the handler you must provide the same pointer data as provided on handler installation. This is done to avoid removing a handler that was installed twice but with different contexts. Think about a function that install the same handler but with different data. The appropiate handler to uninstall and its associated data can only be matched this way.|
- axl_true if the function uninstalled the handler otherwise axl_false is returned.