[Qt] freeing hooks -> could caused sigsevs.

[Den Jean]

Hi Zeljko,

I forgot to mention that I found
and fixed a bug (use of invalid pointer) 
in qobject_hook.h

I left printfs in the code, so that you can
activate them and find out how 
it affected your existing code:


  virtual ~QObject_hook() {
    if (handle) {
      //printf("before calling potentially dangling pointer handle...\n");
      handle->removeEventFilter(this);
      //printf("after calling potentially dangling pointer handle.\n");
      handle->disconnect(this);
      handle = NULL;
    } //else printf("avoided dangling pointer problem\n");
  }

sorry for the bug :-)

Den Jean.