[gdm] sessions: Remove unused 'id' variable

[Ray Strode <halfline src gnome org>]

commit d592b01e3761ec6fd431c3e5a3f8797ab803018e
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Sun Jul 21 16:49:56 2019 +0200

    sessions: Remove unused 'id' variable
    
    The duplicate sessions id is not used in remove_duplicate_sessions(), so remove
    it to mute the warning.
    
    https://gitlab.gnome.org/GNOME/gdm/merge_requests/75

 libgdm/gdm-sessions.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/libgdm/gdm-sessions.c b/libgdm/gdm-sessions.c
index 8ad54576..affc09bb 100644
--- a/libgdm/gdm-sessions.c
+++ b/libgdm/gdm-sessions.c
@@ -167,11 +167,9 @@ remove_duplicate_sessions (gpointer key,
                            gpointer user_data)
 {
         gboolean already_known;
-        const char *id;
         GHashTable *names_seen_before;
         GdmSessionFile *session;
 
-        id = (const char *) key;
         names_seen_before = (GHashTable *) user_data;
         session = (GdmSessionFile *) value;
         already_known = !g_hash_table_add (names_seen_before, session->translated_name);