aoe: don't use flush_scheduled_work()

flush_scheduled_work() is deprecated and scheduled to be removed.
Directly cancel aoedev->work on free instead of depending on
flush_scheduled_works().

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "Ed L. Cashin" <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

drivers/block/aoe/aoedev.c

@@ -102,6 +102,7 @@ aoedev_freedev(struct aoedev *d)
 {
 	struct aoetgt **t, **e;
 
+	cancel_work_sync(&d->work);
 	if (d->gd) {
 		aoedisk_rm_sysfs(d);
 		del_gendisk(d->gd);
@@ -135,7 +136,6 @@ aoedev_flush(const char __user *str, size_t cnt)
 		all = !strncmp(buf, "all", 3);
 	}
 
-	flush_scheduled_work();
 	spin_lock_irqsave(&devlist_lock, flags);
 	dd = &devlist;
 	while ((d = *dd)) {
@@ -257,8 +257,6 @@ aoedev_exit(void)
 	struct aoedev *d;
 	ulong flags;
 
-	flush_scheduled_work();
-
 	while ((d = devlist)) {
 		devlist = d->next;