nvme-pci: return early on ctrl state mismatch in nvme_reset_work

The only way nvme_reset_work could be called when not in resetting state
is if a reset and remove happen near the same time.  This should not
happen, but if it did we don't want the reset work to disable the
controller because the remove is already doing that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>