[easytag] Add missing break in switch

[David King <davidk src gnome org>]

commit 12afb792cf1ff5b5f0ed094867b78836edaa22d4
Author: David King <amigadave amigadave com>
Date:   Thu Apr 17 23:15:07 2014 +0100

    Add missing break in switch
    
    Found with Coverity (CID 1163345)

 src/prefs.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/prefs.c b/src/prefs.c
index e27ffe2..175c415 100644
--- a/src/prefs.c
+++ b/src/prefs.c
@@ -1910,6 +1910,7 @@ et_preferences_on_response (GtkDialog *dialog, gint response_id,
             break;
         case GTK_RESPONSE_DELETE_EVENT:
             OptionsWindow_Quit ();
+            break;
         case GTK_RESPONSE_REJECT:
             OptionsWindow_Cancel_Button ();
             break;