Do not leak interfaces during hit testing (QDA::childAt())

Change-Id: Iebbc1cbbdce57bff6423fa417eac8dbdfe35e510
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>

src/plugins/accessible/shared/qdeclarativeaccessible.cpp

@@ -86,6 +86,7 @@ QAccessibleInterface *QDeclarativeAccessible::childAt(int x, int y) const
             if (childIface->rect().contains(x, y))
                 return childIface;
         }
+        delete childIface;
     }
     return 0;
 }