[libpeas] Fix disabling a loader multiple times

[Steve Frécinaux <sfre src gnome org>]

commit dc9e93340cfb93525f7b2300b8321b357172696c
Author: Garrett Regier <alias301 gmail com>
Date:   Sun Feb 6 03:59:14 2011 -0800

    Fix disabling a loader multiple times

 libpeas/peas-engine.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/libpeas/peas-engine.c b/libpeas/peas-engine.c
index 2e5b8d2..9aecbe7 100644
--- a/libpeas/peas-engine.c
+++ b/libpeas/peas-engine.c
@@ -683,7 +683,7 @@ peas_engine_disable_loader (PeasEngine  *engine,
 
   loader_info = (LoaderInfo *) g_hash_table_lookup (engine->priv->loaders,
                                                     loader_id);
-  if (loader_info != NULL)
+  if (loader_info != NULL && loader_info->module != NULL)
     {
       g_warning ("Loader '%s' cannot be disabled as it is already loaded",
                  loader_id);
@@ -692,7 +692,8 @@ peas_engine_disable_loader (PeasEngine  *engine,
 
   /* By adding a NULL loader, we simulate a failed load attempt, effectively
    * disabling the loader for further use. */
-  add_loader (engine, loader_id, NULL, NULL);
+  if (loader_info == NULL)
+    add_loader (engine, loader_id, NULL, NULL);
 }
 
 /**