e4defrag: fix file blocks calculation

e4defrag uses st_blocks (struct stat) to calculate file blocks. However,
st_blocks also has meta data blocks in addition to file blocks. So, we
calculate file blocks by sum of the extent length.

Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed