[easytag] Add missing case when calling opus_tags_parse()

[David King <davidk src gnome org>]

commit a31b38c1c0fa9603ecf67b47ea622c59cf9eb2f5
Author: James Cowgill <james410 cowgill org uk>
Date:   Mon Sep 7 15:43:11 2015 +0100

    Add missing case when calling opus_tags_parse()
    
    The case for a "successful" return value was missing so saving an opus
    file was always causing easytag to abort at the assertion in the default
    case block.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=754685

 src/tags/vcedit.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/tags/vcedit.c b/src/tags/vcedit.c
index ba5443a..536170b 100644
--- a/src/tags/vcedit.c
+++ b/src/tags/vcedit.c
@@ -610,6 +610,9 @@ vcedit_open (EtOggState *state,
                                                      header->packet,
                                                      header->bytes))
                             {
+                                case 0:
+                                    break;
+
                                 case OP_ENOTFORMAT:
                                     g_set_error (error, ET_OGG_ERROR,
                                                  ET_OGG_ERROR_HEADER,