kmsagnosticbin: Fix unexpected behaviour produced by unlocking an unlocked mutex
kmsagnosticbin: Fix unexpected behaviour produced by unlocking an unlocked mutex

Change-Id: Ifd85b1c9de8fc88e4f5a827837dbe10077d9a90c

Kurento/kms-core,ESTOS/kms-core,Kurento/kms-core,TribeMedia/kms-core,TribeMedia/kms-core,ESTOS/kms-core,Kurento/kms-core,shelsonjava/kms-core,TribeMedia/kms-core,TribeMedia/kms-core,shelsonjava/kms-core,ESTOS/kms-core,KurentoLegacy/gst-kurento-plugins,ESTOS/kms-core,Kurento/kms-core,KurentoLegacy/gst-kurento-plugins,KurentoLegacy/gst-kurento-plugins,shelsonjava/kms-core,shelsonjava/kms-core,KurentoLegacy/gst-kurento-plugins