main: simplify iteration over configured slots
main: simplify iteration over configured slots

The variables key & value are not needed here.

Signed-off-by: Ulrich Ölmann <dd989c3d4b9e0c1c162946243f1ca35d034a3035@pengutronix.de>

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