flacdec: There is an even smaller FLAC frame size possibility.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17821 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/flacdec.c

@@ -651,7 +651,7 @@ static int flac_decode_frame(AVCodecContext *avctx,
 
     /* check that there is at least the smallest decodable amount of data.
        this amount corresponds to the smallest valid FLAC frame possible. */
-    if (buf_size < 16)
+    if (buf_size < 11)
         goto end;
 
     /* check for inline header */