cleanup/fix RIRB processing:

* move the code for azalia_comresp() to be nearer the functions it
  uses (azalia_set_command() and azalia_get_response()) for easier
  comprehension.
* don't turn off RIRB interrupts in azalia_set_command(), then reenable
  them in azalia_get_response().  it's ugly, problematic, and the code
  is already at SPL_AUDIO.
* in azalia_get_response(), wait for a solicited response (the response
  from azalia_set_command()) instead of "waiting" for just any response
  as there may already be an unsolicited response in the RIRB.
* no need to run the unsolicited response handler in azalia_get_response().
  since RIRB interrupts aren't being disables, the unsolicited response
  handler will be run by the RIRB interrupt handler.
* in azalia_rirb_intr(), when a solicited response is found in the RIRB,
  instead of stopping and losing the response, print a debug message
  and keep going.  there should never be a solicited response in the
  RIRB at this point.
* remove some now useless #if 0'd debug cruft.
* minor KNF while here.

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