10l, set ret to 0 when finished

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17931 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffmpeg.c

@@ -2231,6 +2231,7 @@ static int av_encode(AVFormatContext **output_files,
     }
 
     /* finished ! */
+    ret = 0;
 
  fail:
     av_freep(&bit_buffer);