fscrypt: Fix Data Unit Number used in file encryption

Revert sizeof() usage introduced with
I7981fa7f8f0c4bc058b80b7b8e342cfd81697c74

Change-Id: I004d6c36af6b2c4d99e5149aed5a4b03fcc3dbe6
Signed-off-by: Neeraj Soni <neersoni@codeaurora.org>
1 file changed