s390/qdio: rework q->qdio_error indication
When inspecting a queue, any error is currently returned back through the queue's qdio_error field. Turn this into a proper variable that gets passed through the call chain, so that the lifetime is clear and the error state can be accessed along the way. Signed-off-by:Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by:
Benjamin Block <bblock@linux.ibm.com> Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com>
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