Possible massive memory leakage in wacom tablet / X11 event handling.

Found massive memory leakage in our application using (modified) valgrind :
This bug was found using Mandriva 2008. In our Mandriva 2010 setup, it never enters that function at all, probably due to different wacom events from driver?. Still, its a Qt bug.

In function :
void fetchWacomToolId(int &deviceType, qint64 &serialId)

...
WACOMCONFIG *config = ptrWacomConfigInit(X11->display, 0);
if (config == 0)
return;
const char *name = "stylus"; // TODO get this from the X config instead (users may have called it differently)
WACOMDEVICE *device = ptrWacomConfigOpenDevice (config, name);
if (device == 0)
return;
...

If ptrWacomConfigOpenDevice returns 0, config is leaked.
Fix : Add ptrWacomConfigTerm(config) :

if (device == 0)
{
ptrWacomConfigTerm(config);
return;
}