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The ordering of interrupts would sometimes mean the xfer was finished with while the timeout function was waiting to run, leading to an attempt to pass an empty queue (xfer->pipe->queue) to USBDriver via USBDriver_TransferComplete. This would lead to a NULL pointer read when in usbdi.c when it looked at the queue contents.
Adopt the fix from NetBSD xhci.c revision 1.96, so only do a timeout if the xfer wasn is progress.

Version 0.29. Tagged as 'XHCIDriver-0_29'