lavf/flacenc: fix comment after previous change

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

libavformat/flacenc.c

@@ -105,7 +105,7 @@ static int flac_write_header(struct AVFormatContext *s)
     /* The command line flac encoder defaults to placing a seekpoint
      * every 10s.  So one might add padding to allow that later
      * but there seems to be no simple way to get the duration here.
-     * So let's try the flac default of 8192 bytes */
+     * So just add the amount requested by the user. */
     if (padding)
         flac_write_block_padding(s->pb, padding, 1);