service: remove unused variable
service: remove unused variable

cleanup unused variables

Signed-off-by: Michael Grzeschik <56a917ffddddef251f53499c2bdc20635fcae7f7@pengutronix.de>

ejoerns/rauc,ejoerns/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc,rauc/rauc,rauc/rauc,jluebbe/rauc,jluebbe/rauc