nvme-pci: Fix queue double allocations

The queue count says the highest queue that's been allocated, so don't
reallocate a queue lower than that.

Fixes: 147b27e4bd ("nvme-pci: allocate device queues storage space at probe")
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/pci.c

@@ -1384,6 +1384,9 @@ static int nvme_alloc_queue(struct nvme_dev *dev, int qid,
 {
 	struct nvme_queue *nvmeq = &dev->queues[qid];
 
+	if (dev->ctrl.queue_count > qid)
+		return 0;
+
 	nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth),
 					  &nvmeq->cq_dma_addr, GFP_KERNEL);
 	if (!nvmeq->cqes)