webrtcendpoint: Fix memory leak
webrtcendpoint: Fix memory leak

Change-Id: I77ed6587bcdaf6e15f9a07537786dce025ebeafa

Kurento/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,shelsonjava/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements