[gconf] Revert d7917514549f48297bc0032a7e2b54bfb17f7495 and clarify comment

[Ross Burton <rburton src gnome org>]

commit 5b4330b2cac60b817ff94730e187e4ea87cd8597
Author: Vincent Untz <vuntz gnome org>
Date:   Mon Oct 31 16:00:08 2011 +0100

    Revert d7917514549f48297bc0032a7e2b54bfb17f7495 and clarify comment
    
    https://bugzilla.gnome.org/show_bug.cgi?id=662991

 gconf/gconf-database.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/gconf/gconf-database.c b/gconf/gconf-database.c
index 91fc612..1bebc6b 100644
--- a/gconf/gconf-database.c
+++ b/gconf/gconf-database.c
@@ -797,14 +797,15 @@ gconf_database_set_sources (GConfDatabase *db,
 {
   if (db->sources != NULL)
     {
-      /* this function should only be used when creating the db with the corba
-       * backend */
 #ifdef HAVE_CORBA
-      gconf_sources_clear_cache(db->sources);
-      gconf_sources_free(db->sources);
-#else
+      /* in the corba backend, this function should only be used when creating
+       * the db; so assert when it was already created earlier (ie, when the
+       * sources are already set) */
       g_assert_not_reached ();
 #endif
+
+      gconf_sources_clear_cache(db->sources);
+      gconf_sources_free(db->sources);
     }
 
   db->sources = sources;