agnosticbin: set state to NULL after removing the element
agnosticbin: set state to NULL after removing the element

Change-Id: Ifff4ed051559088030291bfb6322492a31494be8

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