misc: replace remaining loff_t with ext2_loff_t

Replace the remaining loff_t uses with ext2_loff_t, as
was done in patch 1df6a4555, since loff_t is a GCC'ism
and is not portable.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
3 files changed