Use xpt_path_inq() for all XPT_PATH_INQ requests. They all should be
CAM_PRIORITY_NONE since XPT_PATH_INQ is an unqueued command, so the
monor changes here from _NORMAL to _NONE don't matter. And the one place
we preseve the priority doesn't matter either: It's an allocated CCB,
true, but it only ever stores the CPI from XPT_PATH_INQ.
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