Create: make sure chosen_name is used for array name generation in Create

As with Assemble, one create_mddev has chosen a name, we should always
use that rather than the passed 'mddev'.

Signed-off-by: NeilBrown <neilb@suse.de>

Create.c

@@ -428,6 +428,7 @@ int Create(struct supertype *st, char *mddev,
 	mdfd = create_mddev(mddev, name, autof, LOCAL, chosen_name);
 	if (mdfd < 0)
 		return 1;
+	mddev = chosen_name;
 
 	vers = md_get_version(mdfd);
 	if (vers < 9000) {