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/core/seq/seq_fifo.c

@@ -179,7 +179,7 @@ int snd_seq_fifo_cell_out(struct snd_seq_fifo *f,
 {
 	struct snd_seq_event_cell *cell;
 	unsigned long flags;
-	wait_queue_t wait;
+	wait_queue_entry_t wait;
 
 	if (snd_BUG_ON(!f))
 		return -EINVAL;

sound/core/seq/seq_memory.c

@@ -227,7 +227,7 @@ static int snd_seq_cell_alloc(struct snd_seq_pool *pool,
 	struct snd_seq_event_cell *cell;
 	unsigned long flags;
 	int err = -EAGAIN;
-	wait_queue_t wait;
+	wait_queue_entry_t wait;
 
 	if (pool == NULL)
 		return -EINVAL;