aio: cleanup: flatten kill_ioctx()

There is no need to have most of the code in kill_ioctx() indented.  Flatten
it.
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>

fs/aio.c

@@ -730,9 +730,12 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
 static int kill_ioctx(struct mm_struct *mm, struct kioctx *ctx,
 		struct completion *requests_done)
 {
-	if (!atomic_xchg(&ctx->dead, 1)) {
 	struct kioctx_table *table;
 
+	if (atomic_xchg(&ctx->dead, 1))
+		return -EINVAL;
+
+
 	spin_lock(&mm->ioctx_lock);
 	rcu_read_lock();
 	table = rcu_dereference(mm->ioctx_table);
@@ -760,9 +763,6 @@ static int kill_ioctx(struct mm_struct *mm, struct kioctx *ctx,
 	ctx->requests_done = requests_done;
 	percpu_ref_kill(&ctx->users);
 	return 0;
-	}
-
-	return -EINVAL;
 }
 
 /* wait_on_sync_kiocb: