sched/wait: Rename wait_queue_t => wait_queue_entry_t

Rename:

	wait_queue_t		=>	wait_queue_entry_t

'wait_queue_t' was always a slight misnomer: its name implies that it's a "queue",
but in reality it's a queue *entry*. The 'real' queue is the wait queue head,
which had to carry the name.

Start sorting this out by renaming it to 'wait_queue_entry_t'.

This also allows the real structure name 'struct __wait_queue' to
lose its double underscore and become 'struct wait_queue_entry',
which is the more canonical nomenclature for such data types.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

sound/isa/wavefront/wavefront_synth.c

@@ -1782,7 +1782,7 @@ wavefront_should_cause_interrupt (snd_wavefront_t *dev,
 				  int val, int port, unsigned long timeout)
 
 {
-	wait_queue_t wait;
+	wait_queue_entry_t wait;
 
 	init_waitqueue_entry(&wait, current);
 	spin_lock_irq(&dev->irq_lock);