[gtk+/portal] Add a missing break

[Matthias Clasen <matthiasc src gnome org>]

commit 1512f6984b6b5bfa3cebf99cfc96683a072bece1
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 6 20:10:35 2016 -0400

    Add a missing break
    
    Spotted by Cosimo.

 gtk/gtkfilechoosernative.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkfilechoosernative.c b/gtk/gtkfilechoosernative.c
index b4191e9..3605b73 100644
--- a/gtk/gtkfilechoosernative.c
+++ b/gtk/gtkfilechoosernative.c
@@ -747,6 +747,7 @@ gtk_file_chooser_native_hide (GtkNativeDialog *native)
 #ifdef GDK_WINDOWING_WIN32
       gtk_file_chooser_native_win32_hide (self);
 #endif
+      break;
     case MODE_PORTAL:
       gtk_file_chooser_native_portal_hide (self);
       break;