Fixed dosfsck on big endian platforms (Resolves: rhbz#1029695).

It seems there is problem in the double conversion on big endians.
The first conversion is done by the explicit conversion to __u16
in the GET_UNALIGNED_W macro, so the secondary conversion by le16toh
seems to be redundant (and wrong).

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
Releasing version 3.0.24.

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>