fixed some warnings

Change-Id: Ib371d618efd180abe919f6943ee630e6fcdcfe00
Reviewed-on: http://gerrit.esdi-community.eu/3219
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>