[mutter/wayland] monitor: Suppress -Werror=unused-variable

[Jasper St. Pierre <jstpierre src gnome org>]

commit 7b15d21e40fba2a4160d722c963ad3ebddbcbddf
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Jan 9 11:53:29 2014 +0100

    monitor: Suppress -Werror=unused-variable
    
    Fallout from 477acddf642d735ef036a95fda6f4d7f6b522fd1
    
    https://bugzilla.gnome.org/show_bug.cgi?id=721674

 src/core/monitor.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/core/monitor.c b/src/core/monitor.c
index 75462e7..db47899 100644
--- a/src/core/monitor.c
+++ b/src/core/monitor.c
@@ -617,7 +617,6 @@ make_display_name (MetaMonitorManager *manager,
   char *inches = NULL;
   char *vendor_name = NULL;
   char *ret;
-  gboolean is_unknown = FALSE;
 
   if (g_str_has_prefix (output->name, "LVDS") ||
       g_str_has_prefix (output->name, "eDP"))