When an endpoint stalls, we usually try to reset it by calling

usbd_clear_endpoint_stall(), which in turn will call
usbd_clear_endpoint_toggle().  It can be a common situation that when
this happens, there is still a transfer in the stalled queue being
in progress.  The ehci(4) clear toggle function is currently doing a
panic() in the diagnostic code in this situation, which is a bit of
an overkill.  The device still can be recovered by detaching/attaching
it.  Therefore change the panic() in to a printf().

ok mpi@

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