fix memory leak in oggenc

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/oggenc.c

@@ -519,6 +519,8 @@ static int ogg_write_trailer(AVFormatContext *s)
             av_free(oggstream->header[0]);
             av_free(oggstream->header[1]);
         }
+        else
+            av_free(oggstream->header[1]);
         av_freep(&st->priv_data);
     }
     return 0;