driver core: Delete an unnecessary check before the function call "put_device"

commit 5f0163a5 upstream.

The put_device() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[wt: backported only to ease next patch as suggested by Jiri]
Signed-off-by: Willy Tarreau <w@1wt.eu>

drivers/base/core.c

@@ -1138,8 +1138,7 @@ int device_add(struct device *dev)
 	kobject_del(&dev->kobj);
  Error:
 	cleanup_device_parent(dev);
-	if (parent)
-		put_device(parent);
+	put_device(parent);
 name_error:
 	kfree(dev->p);
 	dev->p = NULL;