RTSPMessage.unset

Unset the contents of msg so that it becomes an uninitialized #GstRTSPMessage again. This function is mostly used in combination with [gstrtsp.rtspmessage.RTSPMessage.initRequest], [gstrtsp.rtspmessage.RTSPMessage.initResponse] and [gstrtsp.rtspmessage.RTSPMessage.initData] on stack allocated #GstRTSPMessage structures.