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>

drivers/infiniband/hw/i40iw/i40iw_main.c

@@ -1939,7 +1939,7 @@ static int i40iw_virtchnl_receive(struct i40e_info *ldev,
 bool i40iw_vf_clear_to_send(struct i40iw_sc_dev *dev)
 {
 	struct i40iw_device *iwdev;
-	wait_queue_t wait;
+	wait_queue_entry_t wait;
 
 	iwdev = dev->back_dev;