assembled a buffer from multiple dir blocks, and we can use that in
obfuscate_dir_data_block() to continue past the first filesystem block
and continue obfuscating the entire thing.
Without this, anything after the first block was skipped, and
remained as cleartext.
Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Eric Sandeen <sandeen@sandeen.net> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>