added a missing (not)

modules/prelude-packages.el

@@ -47,18 +47,18 @@
 
 (defun prelude-packages-installed-p ()
   (loop for p in prelude-packages
-        when (package-installed-p p) do (return nil)
+        when (not (package-installed-p p)) do (return nil)
         finally (return t)))
 
 (unless (prelude-packages-installed-p)
   ;; check for new packages (package versions)
   (message "%s" "Emacs Prelude is now refreshing its package database...")
   (package-refresh-contents)
-  (message "%s" " done."))
-
+  (message "%s" " done.")
+  ;; install the missing packages
   (dolist (p prelude-packages)
     (when (not (package-installed-p p))
-    (package-install p)))
+      (package-install p))))
 
 (provide 'prelude-packages)