[easytag] Fix check for errors when writing WavPack tags

[David King <davidk src gnome org>]

commit 8f48a76c0d97d72642fe83d715298d9fc073bd0c
Author: David King <amigadave amigadave com>
Date:   Thu Dec 18 16:46:33 2014 +0000

    Fix check for errors when writing WavPack tags

 src/tags/wavpack_tag.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/tags/wavpack_tag.c b/src/tags/wavpack_tag.c
index b0ffa4b..4f947eb 100644
--- a/src/tags/wavpack_tag.c
+++ b/src/tags/wavpack_tag.c
@@ -420,7 +420,7 @@ wavpack_tag_write_file_tag (const ET_File *ETFile,
         goto err;
     }
 
-    if (WavpackWriteTag (wpc) != 0)
+    if (WavpackWriteTag (wpc) == 0)
     {
         goto err;
     }