missing parenthesis

config.scm

@@ -42,8 +42,7 @@
   (file-systems
     (cons* (file-system
              (mount-point "/")
-             (device
-               (file-system-label "guix")
+             (device (file-system-label "guix"))
              (type "ext4"))
            %base-file-systems))
   )