block: don't call blk_drain_queue() if elevator is not up

blk_cleanup_queue() may be called before elevator is set up on a
queue which triggers the following oops.

 BUG: unable to handle kernel NULL pointer dereference at           (null)
 IP: [<ffffffff8125a69c>] elv_drain_elevator+0x1c/0x70
 ...
 Pid: 830, comm: kworker/0:2 Not tainted 3.1.0-next-20111025_64+ #1590
 Bochs Bochs
 RIP: 0010:[<ffffffff8125a69c>]  [<ffffffff8125a69c>] elv_drain_elevator+0x1c/0x70
 ...
 Call Trace:
  [<ffffffff8125da92>] blk_drain_queue+0x42/0x70
  [<ffffffff8125db90>] blk_cleanup_queue+0xd0/0x1c0
  [<ffffffff81469640>] md_free+0x50/0x70
  [<ffffffff8126f43b>] kobject_release+0x8b/0x1d0
  [<ffffffff81270d56>] kref_put+0x36/0xa0
  [<ffffffff8126f2b7>] kobject_put+0x27/0x60
  [<ffffffff814693af>] mddev_delayed_delete+0x2f/0x40
  [<ffffffff81083450>] process_one_work+0x100/0x3b0
  [<ffffffff8108527f>] worker_thread+0x15f/0x3a0
  [<ffffffff81089937>] kthread+0x87/0x90
  [<ffffffff81621834>] kernel_thread_helper+0x4/0x10

Fix it by making blk_cleanup_queue() check whether q->elevator is set
up before invoking blk_drain_queue.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>