The FAT16/12 has rootdir area before data area, and the clusters for
rootdir are not mantained by FAT table. So we don't need to find empty
cluster for next rootdir space, just use next dir cluster. And the FAT
table don't need to update for this new dir cluster.
Signed-off-by: Ye Li <ye.li@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>