namespace: fix propagated error number

src/core/namespace.c

@@ -930,7 +930,7 @@ static int mount_private_dev(MountEntry *m) {
 
         r = label_fix_container(dev, "/dev", 0);
         if (r < 0) {
-                log_debug_errno(errno, "Failed to fix label of '%s' as /dev: %m", dev);
+                log_debug_errno(r, "Failed to fix label of '%s' as /dev: %m", dev);
                 goto fail;
         }