- filerec_free() in csum_whole_file can race other threads, move it under
  lock for now.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Move filerec_token code to filerec.c. Have compared tree use filerec_token
as they're basically the same thing.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>