[metacity] util: fix build warning

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 7c6bba5b671e191102d76a402bb4cb3011522505
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Sep 20 17:16:00 2015 +0300

    util: fix build warning

 src/core/util.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/core/util.c b/src/core/util.c
index 4204e59..363f615 100644
--- a/src/core/util.c
+++ b/src/core/util.c
@@ -319,6 +319,8 @@ topic_name (MetaDebugTopic topic)
       return "COMPOSITOR";
     case META_DEBUG_EDGE_RESISTANCE:
       return "EDGE_RESISTANCE";
+    default:
+      break;
     }
 
   return "WM";
@@ -471,7 +473,6 @@ meta_pop_no_msg_prefix (void)
 void
 meta_exit (MetaExitCode code)
 {
-
   exit (code);
 }