basesrc: Make sure to always hold the LIVE_LOCK when going to the flushing label
basesrc: Make sure to always hold the LIVE_LOCK when going to the flushing label

https://bugzilla.gnome.org/show_bug.cgi?id=728596

justinjoy/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer,justinjoy/gstreamer