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>
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 9602a7e..a73baa1 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -85,7 +85,7 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
 	int major = imajor(inode);
 	struct snd_hwdep *hw;
 	int err;
-	wait_queue_t wait;
+	wait_queue_entry_t wait;
 
 	if (major == snd_major) {
 		hw = snd_lookup_minor_data(iminor(inode),