[fprint] latest fprint_demo and pam_fprint git issues

[Flocchini]

I just compled latest git ebuild and auth with my fingerprint still works but 
i'm getting strange messages:

i.e., authenticating via shell

flocchini at sovereign ~ $ su
Scan finger on Digital Persona U.are.U 4000/4000B
libusb:error [libusb_cancel_transfer] cancel transfer failed error -1
sovereign flocchini # 

anyway, auth works :)

fprint_demo no longer works, I see the new bar with "bouncing" indicator but 
my fingerprint reader seems to be dead, usually it becomes red instead when 
asked to enroll

here the console output for my tries to verify my previous enrolled finger:

sovereign flocchini # fprint_demo
** Message: now monitoring fd 4
async:error [fp_async_verify_stop] BUG at async.c:291
fp:error [fpi_imgdev_activate_complete] unhandled action 0
async:error [fp_async_verify_stop] BUG at async.c:291
fp:error [fpi_imgdev_activate_complete] unhandled action 0
fp:error [fpi_imgdev_activate_complete] unhandled action 0
** Message: no longer monitoring fd 4
sovereign flocchini #

really not very important for me, auth works anyway, but hope this helps in 
development :)