dtls: Fix memory leak on test
dtls: Fix memory leak on test

Change-Id: I6642b9c127a360ee4444bf97d4b5bd35b20bc4ff

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