nvme: remove redundant validation in nvme_start_ctrl()

We've already validated the 'kato' in nvme_start_keep_alive(), thus no
need to validate it again in nvme_start_ctrl(). Remove it.
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/core.c

@@ -4313,8 +4313,7 @@ EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
 
 void nvme_start_ctrl(struct nvme_ctrl *ctrl)
 {
-	if (ctrl->kato)
-		nvme_start_keep_alive(ctrl);
+	nvme_start_keep_alive(ctrl);
 
 	nvme_enable_aen(ctrl);