pointerdetector: Fix segmentation fault in finalize
pointerdetector: Fix segmentation fault in finalize

Change-Id: I6303db216005d5b5b579b070d45ed553662fb8a6

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