targa_y216dec: remove empty function

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/targa_y216dec.c

@@ -72,19 +72,12 @@ static int y216_decode_frame(AVCodecContext *avctx, void *data,
     return avpkt->size;
 }
 
-static av_cold int y216_decode_close(AVCodecContext *avctx)
-{
-
-    return 0;
-}
-
 AVCodec ff_targa_y216_decoder = {
     .name         = "targa_y216",
     .type         = AVMEDIA_TYPE_VIDEO,
     .id           = AV_CODEC_ID_TARGA_Y216,
     .init         = y216_decode_init,
     .decode       = y216_decode_frame,
-    .close        = y216_decode_close,
     .capabilities = CODEC_CAP_DR1,
     .long_name    = NULL_IF_CONFIG_SMALL("Pinnacle TARGA CineWave YUV16"),
 };