filefrag: fix frag count in bmap case

The fragmentation count in the bmap case seems to be
off by one:

/mnt/test/bar: 0 extents found

Addresses-Debian-Bug: #540376

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed