[gnome-menus] desktop-entries: fix trivial bug in handling of multiple desktops in XDG_CURRENT_DESKTOP.

[Josselin Mouette <jmouette src gnome org>]

commit 4befe76fbdb76aa6a986297ef71d1601b2ced42e
Author: Josselin Mouette <joss debian org>
Date:   Sun Dec 14 20:36:36 2014 +0100

    desktop-entries: fix trivial bug in handling of multiple desktops in
    XDG_CURRENT_DESKTOP.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=741505

 libmenu/desktop-entries.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libmenu/desktop-entries.c b/libmenu/desktop-entries.c
index bd4f886..a463d79 100644
--- a/libmenu/desktop-entries.c
+++ b/libmenu/desktop-entries.c
@@ -97,7 +97,7 @@ get_current_desktops (void)
 
       desktops = g_getenv ("XDG_CURRENT_DESKTOP");
 
-      if (desktops)
+      if (!desktops)
         desktops = "";
 
       tmp = g_strsplit (desktops, ":", 0);