Ticket #10766: patch.fixavfdecoder

--- a/mythtv/mythplugins/mythmusic/mythmusic/avfdecoder.cpp     2012-04-24 17:33:38.000000000 +0930
+++ b/mythtv/mythplugins/mythmusic/mythmusic/avfdecoder.cpp     2012-05-30 12:27:55.550473950 +0930
@@ -508,10 +508,14 @@ MetaIO* avfDecoder::doCreateTagger(void)
     else if (extension == "flac")
     {
         MetaIOID3 *file = new MetaIOID3();
-        if (file->TagExists(filename))
-            return file;
-        else
-            return new MetaIOFLACVorbis();  
+        if (file)
+        {
+            if (file->TagExists(filename))
+                return file;
+            else
+                delete file;
+        }
+        return new MetaIOFLACVorbis();
     }
     else if (extension == "m4a")
         return new MetaIOMP4();