media-test: Removing unnecessary assertion
media-test: Removing unnecessary assertion

https://bugzilla.gnome.org/show_bug.cgi?id=753385

thaytan/gst-rtsp-server,surround-io/gst-rtsp-server,surround-io/gst-rtsp-server,barisdemiray/gst-rtsp-server,thaytan/gst-rtsp-server,barisdemiray/gst-rtsp-server,thaytan/gst-rtsp-server,surround-io/gst-rtsp-server,barisdemiray/gst-rtsp-server