f2fs-tools: resolve build warnings

Change-Id: Id0a64edd6dbb42ffab8f14c9e67671164b3114ba
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
mkfs: fix the wrong nat bitmap size

We should consider checksum bytes in the checkpoint block.
Previously, this bug incured very critical panics for node entry handling.

Change-Id: Icbf328749c01ff2ada9bdeae59ce4f9e2c0f66ae
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
f2fstat: add option to select partition to see status

If there are some partitions, this may select a partition to see its
status. If no selection, you will see first section of status.

e.g.) f2fstat -p /dev/sda3

Change-Id: If8a33af5f9a7f2e4d171e7730faf65a09dbb0103
Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>