sched/wait: Standardize 'struct wait_bit_queue' wait-queue entry field name

Rename 'struct wait_bit_queue::wait' to ::wq_entry, to more clearly
name it as a wait-queue entry.

Propagate it to a couple of usage sites where the wait-bit-queue internals
are exposed.

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/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 990210f..b9c12e1 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -269,12 +269,12 @@ xfs_inew_wait(
 	DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_INEW_BIT);
 
 	do {
-		prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
+		prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
 		if (!xfs_iflags_test(ip, XFS_INEW))
 			break;
 		schedule();
 	} while (true);
-	finish_wait(wq, &wait.wait);
+	finish_wait(wq, &wait.wq_entry);
 }
 
 /*