s390/qdio: eliminate queue's last_move cursor
This cursor is used for debugging only. But since commit "s390/qdio: pass up count of ready-to-process SBALs" it effectively duplicates the first_to_check cursor, diverging for just a short moment when get_*_buffer_frontier() updates q->first_to_check. Signed-off-by: NJulian Wiedmann <jwi@linux.ibm.com> Reviewed-by: NJens Remus <jremus@linux.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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