Attached is a patch that cleans up a few more issues in the OHCI unlink
code.

There may still be an ISO-IN data problem, I'll look at that separately
since it seems unrelated to unlink issues.

- Simplify/correct ED lifecycle
	* UNLINK is now for real: descheduled and waiting for SOF
	* finish_unlinks() expects descheduled EDs (may reschedule)
	* only ed_deschedule() turns off hardware schedule processing
	* no more NEW state
	* no more ED_URB_DEL flag (it added extra states)
	* new IDLE state, "not scheduled" (replaces previous UNLINKing)
- Bugfixes
	* ed_get(), potential memleak is now gone
	* urb_enqueue(), won't submit to dead/sleeping hc
	* free_config(), rescans after SOF when needed
	* ed_schedule(), use wmb()
	* ed_schedule() and finish_unlinks(), more thorough about
	  restarting control or bulk processing
	* finish_unlinks(), more cautious about reentering
- General:
	* ed->ed_rm_list renamed ed_next; to be used more later
	* slightly shrink object code
	* rename some functions

This leaves one notable issue in the unlink paths:  the driver never waits
for SOF after descheduling (empty) EDs.  That's racey in most cases, though
there are a few light-traffic cases where that's correct (in part because
the ED is empty).  Easy to fix once the rest of this is known to behave.