[PATCH] usbatm: Update to use the kthread api.

[Duncan Sands]

Hi Cedric,

> Here's one I have been keeping for a while. Nothing really fancy : 
> basic replacement of kernel_thread and removal of the start
> completion which is now covered in kthread.

the signal needs to be unblocked before the start completion,
since otherwise the signal might be sent while signals are
blocked (though this is extremely unlikely).  So you can't
rely on kthread's start completion I'm afraid, because that
happens before the unblocking.

Ciao,

Duncan.