nvme: introduce a helper function for controller deletion

This patch does not change any functionality but makes the next patch
in this series easier to read.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/core.c

@@ -151,11 +151,8 @@ int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
 }
 EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
 
-static void nvme_delete_ctrl_work(struct work_struct *work)
+static void nvme_do_delete_ctrl(struct nvme_ctrl *ctrl)
 {
-	struct nvme_ctrl *ctrl =
-		container_of(work, struct nvme_ctrl, delete_work);
-
 	dev_info(ctrl->device,
 		 "Removing ctrl: NQN \"%s\"\n", ctrl->opts->subsysnqn);
 
@@ -167,6 +164,14 @@ static void nvme_delete_ctrl_work(struct work_struct *work)
 	nvme_put_ctrl(ctrl);
 }
 
+static void nvme_delete_ctrl_work(struct work_struct *work)
+{
+	struct nvme_ctrl *ctrl =
+		container_of(work, struct nvme_ctrl, delete_work);
+
+	nvme_do_delete_ctrl(ctrl);
+}
+
 int nvme_delete_ctrl(struct nvme_ctrl *ctrl)
 {
 	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))