- Remove code duplication by adding two new functions to execute prepared
queue entry via either mbox or request queue and wait for result.
- Since the new function executing via request queue sleeps any way, make
it sleep also in case of overflows or handle shortages. It should make it
more reliable and less affecting other less flexible request queue users.
- Turn isp_target_put_entry() into not target-specific isp_send_entry().
- Make handling of responses with control handles more universal.
- Move RQSTYPE_RPT_ID_ACQ handling into new function.
- Inline isp_handle_other_response(), becoming trivial after above.
- Clean the list of IOCBs from pre-24xx ones.
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