[gtk+] Add default return values to switch statements

[Benjamin Otte <otte src gnome org>]

commit 8549e62d8595bb6f94b51f2051f8542e357f236b
Author: Benjamin Otte <otte redhat com>
Date:   Tue Oct 24 18:13:45 2017 +0200

    Add default return values to switch statements
    
    We are using g_assert_not_reached() without doing anything, assuming it
    aborts the program. In release builds however, it is ignored.

 gdk/x11/gdkdevicemanager-core-x11.c |    2 ++
 gdk/x11/gdkdevicemanager-xi2.c      |    2 ++
 gtk/gtkcssselector.c                |    1 +
 gtk/inspector/general.c             |    2 +-
 4 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gdk/x11/gdkdevicemanager-core-x11.c b/gdk/x11/gdkdevicemanager-core-x11.c
index 350a79b..dd8613e 100644
--- a/gdk/x11/gdkdevicemanager-core-x11.c
+++ b/gdk/x11/gdkdevicemanager-core-x11.c
@@ -265,6 +265,7 @@ translate_crossing_mode (int mode)
       return GDK_CROSSING_UNGRAB;
     default:
       g_assert_not_reached ();
+      return GDK_CROSSING_NORMAL;
     }
 }
 
@@ -285,6 +286,7 @@ translate_notify_type (int detail)
       return GDK_NOTIFY_NONLINEAR_VIRTUAL;
     default:
       g_assert_not_reached ();
+      return GDK_NOTIFY_UNKONWN;
     }
 }
 
diff --git a/gdk/x11/gdkdevicemanager-xi2.c b/gdk/x11/gdkdevicemanager-xi2.c
index 8779c65..758513e 100644
--- a/gdk/x11/gdkdevicemanager-xi2.c
+++ b/gdk/x11/gdkdevicemanager-xi2.c
@@ -1068,6 +1068,7 @@ translate_crossing_mode (gint mode)
       /* Fall through, unexpected in pointer crossing events */
     default:
       g_assert_not_reached ();
+      return GDK_CROSSING_NORMAL;
     }
 }
 
@@ -1088,6 +1089,7 @@ translate_notify_type (gint detail)
       return GDK_NOTIFY_NONLINEAR_VIRTUAL;
     default:
       g_assert_not_reached ();
+      return GDK_NOTIFY_UNKONWN;
     }
 }
 
diff --git a/gtk/gtkcssselector.c b/gtk/gtkcssselector.c
index 241a690..961e78e 100644
--- a/gtk/gtkcssselector.c
+++ b/gtk/gtkcssselector.c
@@ -876,6 +876,7 @@ change_pseudoclass_position (const GtkCssSelector *selector)
       return GTK_CSS_CHANGE_FIRST_CHILD | GTK_CSS_CHANGE_LAST_CHILD;
     default:
       g_assert_not_reached ();
+      return 0;
     }
 }
 
diff --git a/gtk/inspector/general.c b/gtk/inspector/general.c
index 2e7e212..62404a0 100644
--- a/gtk/inspector/general.c
+++ b/gtk/inspector/general.c
@@ -501,7 +501,7 @@ translate_subpixel_layout (GdkSubpixelLayout subpixel)
     case GDK_SUBPIXEL_LAYOUT_HORIZONTAL_BGR: return "horizontal bgr";
     case GDK_SUBPIXEL_LAYOUT_VERTICAL_RGB: return "vertical rgb";
     case GDK_SUBPIXEL_LAYOUT_VERTICAL_BGR: return "vertical bgr";
-    default: g_assert_not_reached ();
+    default: g_assert_not_reached (); return "none;
     }
 }