Fix debugfs's dump_unsued commands on filesystems with a 64k blocksize

Use EXT2_MAX_BLOCK_SIZE instead of a hardcoded blocksize of 32768, since 
this will fail on a filesystem with a 64k blocksize.  (Addresses SourceForge
bug #1424311)

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2 files changed