[metacity] edge-resistance: fix build warnings

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 67a5d99077428887f0e459b21c6842c14808e017
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Sep 20 05:41:58 2015 +0300

    edge-resistance: fix build warnings

 src/core/edge-resistance.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/core/edge-resistance.c b/src/core/edge-resistance.c
index 20032df..efe336e 100644
--- a/src/core/edge-resistance.c
+++ b/src/core/edge-resistance.c
@@ -427,6 +427,8 @@ apply_edge_resistance (MetaWindow                *window,
                 case META_EDGE_SCREEN:
                   timeout_length_ms = TIMEOUT_RESISTANCE_LENGTH_MS_SCREEN;
                   break;
+                default:
+                  break;
                 }
 
               if (!resistance_data->timeout_setup &&
@@ -478,6 +480,8 @@ apply_edge_resistance (MetaWindow                *window,
               else
                 threshold = PIXEL_DISTANCE_THRESHOLD_AWAYFROM_SCREEN;
               break;
+            default:
+              break;
             }
 
           if (ABS (compare - new_pos) < threshold)