fix typo

tools/starpu_smpirun.in

@@ -67,6 +67,6 @@ EOF
 
 STACKSIZE=$(ulimit -s)
 [ "$STACKSIZE" != unlimited ] || STACKSIZE=8192
-$SMPIRUN -platform $PLATFORM -hostfile $MPI_HOSTFILE "$@" --cfg=smpi/privatize_global_variables:yes --cfg=contexts/stack_size=$STACKSIZE
+$SMPIRUN -platform $PLATFORM -hostfile $MPI_HOSTFILE "$@" --cfg=smpi/privatize_global_variables:yes --cfg=contexts/stack_size:$STACKSIZE
 
 rm -f $TEMP