cldconfig: fix inconsistency in rounding percent values

The number of blocks calculated from a percent value given to the
-min-reclaimable-blocks command line parameter of nilfs-clean is rounded
up. The same percent value in the configuration file is not rounded up.
This patch fixes the inconsistency by rounding up both values.

Signed-off-by: Andreas Rohner <andreas.rohner@gmx.net>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>