[mutter] monitor-manager: Shut up a compiler warning

[Florian Müllner <fmuellner src gnome org>]

commit 8b5d34b24a76ba91dc58a00586722bd14efff9cd
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Jul 14 16:54:53 2017 +0200

    monitor-manager: Shut up a compiler warning
    
    Add a default switch statement to make it clear that 'transform'
    won't be used uninitialized.

 src/backends/meta-monitor-manager.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 166d9a3..f83f391 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -654,6 +654,7 @@ orientation_changed (MetaOrientationManager *orientation_manager,
       break;
 
     case META_ORIENTATION_UNDEFINED:
+    default:
       return;
     }