[PATCH 3/3] libnvdimm/bus: simplify walk_to_nvdimm_bus()

[Zhen Lei]

I first want to move dev_WARN_ONCE() after "if (dev)" branch, but further
I find the "if (dev)" can only be true when is_nvdimm_bus(dev) successed.

No functional change. In fact, the compiler can optimize it correctly. I
run "size drivers/nvdimm/bus.o" and find nothing has changed. So it's
just source code level optimization, make us can read it faster.

Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
---
 drivers/nvdimm/bus.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 955265656b96c73..1d89114cb6ab93e 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -316,10 +316,9 @@ struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev)
 
 	for (dev = nd_dev; dev; dev = dev->parent)
 		if (is_nvdimm_bus(dev))
-			break;
-	dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n");
-	if (dev)
-		return to_nvdimm_bus(dev);
+			return to_nvdimm_bus(dev);
+
+	dev_WARN_ONCE(nd_dev, 1, "invalid dev, not on nd bus\n");
 	return NULL;
 }
 
-- 
1.8.3