nvme: clear the request_queue pointers on failure in nvme_alloc_admin_tag_set

If nvme_alloc_admin_tag_set() fails, the admin_q and fabrics_q pointers
are left with an invalid, non-NULL value. Other functions may then check
the pointers and dereference them, e.g. in

  nvme_probe() -> out_disable: -> nvme_dev_remove_admin().

Fix the bug by setting admin_q and fabrics_q to NULL in case of error.

Also use the set variable to free the tag_set as ctrl->admin_tagset isn't
initialized yet.
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/core.c

@@ -4892,7 +4892,9 @@ int nvme_alloc_admin_tag_set(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set,
 	blk_mq_destroy_queue(ctrl->admin_q);
 	blk_put_queue(ctrl->admin_q);
 out_free_tagset:
-	blk_mq_free_tag_set(ctrl->admin_tagset);
+	blk_mq_free_tag_set(set);
+	ctrl->admin_q = NULL;
+	ctrl->fabrics_q = NULL;
 	return ret;
 }
 EXPORT_SYMBOL_GPL(nvme_alloc_admin_tag_set);