filefrag: fix -B option and extents calculation for FIBMAP

29758d2 broke -B option which is useful for filesystems not supporting
FIEMAP. Also, fix extents calculation for -B which is broken since
2508eaa7.

Signed-off-by: Rakesh Pandit <rakesh@tuxera.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed