This patch was generated by the following semantic patch
(http://coccinelle.lip6.fr/)
// <smpl>
@fix disable is_null,isnt_null1@
expression *E;
@@
- !E
+ E == NULL
// </smpl>
In the case that parent path data needs to be invalidated we shouldn't
stop at the immediate parent if it doesn't have our own handler
registered but should continue upwards in the tree until we reach root
or our own handler.
Previously it was a specific case, now introspection is just another
interface, which is always implemented. It is registered/unregistered
when an object path is referenced first/last.