GstBus should auto-flush on a failed NULL->READY state change
@thaytan
Submitted by Jan Schmidt Assigned to Jan Schmidt @thaytan
Link to original bug (#381603)
Description
A failure to change state to READY in the pipeline should be handled like a NULL->READY->NULL transition and set the bus to auto-flushing, so that default pipelines don't end up with refcount loops due to messages on the bus.