kmselement: Add missing break
kmselement: Add missing break

Change-Id: I77d5ec1d5bd469851e0d3e65ba71ff8f956b2190

ESTOS/kms-core,Kurento/kms-core,ESTOS/kms-core,ESTOS/kms-core,Kurento/kms-core,Kurento/kms-core,Kurento/kms-core,ESTOS/kms-core