webrtcendpoint: Fix memory leak
webrtcendpoint: Fix memory leak

Change-Id: I9bde3212659a17ea8d60200c444216d53dd1ceef

KurentoLegacy/gst-kurento-plugins,shelsonjava/kms-core,Kurento/kms-core,TribeMedia/kms-core,ESTOS/kms-core,ESTOS/kms-core,TribeMedia/kms-core,KurentoLegacy/gst-kurento-plugins,KurentoLegacy/gst-kurento-plugins,TribeMedia/kms-core,Kurento/kms-core,KurentoLegacy/gst-kurento-plugins,shelsonjava/kms-core,TribeMedia/kms-core,Kurento/kms-core,ESTOS/kms-core,shelsonjava/kms-core,Kurento/kms-core,ESTOS/kms-core,shelsonjava/kms-core