[Prevent]

[Prevent]
CID 451233 - atspi-registry.c:atspi_deregister_keystroke_listener (dereference before null check)
CID 451215 - atspi-registry.c:atspi_deregister_device_event_listener (dereference before null check)
CID 451213 - atspi-registry.c:atspi_deregister_device_event_listener (dereference before null check)
CID 451078 - atspi-event-listener.c:_atspi_dbus_handle_evnet (dereference after null check)
CID 451077 - atspi-stateset.c:atspi_state_set_set_by_name (dereference after null check)

Change-Id: I38a6c0062fdae892158fa0a18ba35aadcdc5e855