basehub: Fix memory leak with pads stored on port_data structure
basehub: Fix memory leak with pads stored on port_data structure

Change-Id: I4ee82a818d664bc1fffb1bf540c47b94a486efbf

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