fs/smartfs: modify redo delete operation
fs/smartfs: modify redo delete operation

This patch modifies the entry to make sure it is valid before deleting
the file or directory.

Change-Id: I90ca88bd4b4dfa14b436f1942047e6435a851804
Signed-off-by: Heuisam Kwag <2145cbb01e90577cd4983eccc3b7d9a9dfba6875@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT