vp3: remove redeclaration of vp3_decode_flush

Signed-off-by: Jean First <jeanfirst@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/vp3.c

@@ -2054,8 +2054,6 @@ error:
     return -1;
 }
 
-static void vp3_decode_flush(AVCodecContext *avctx);
-
 static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb)
 {
     Vp3DecodeContext *s = avctx->priv_data;